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In an era of orbital satellites so advanced that they are able to make out objects half the size of cars from space, a spy balloon might seem like a bit of a relic.

They were a prominent tool for reconnaissance during the Cold War and were even used in a more basic form for intelligence gathering in the Napoleonic Wars more than 200 years ago.

But security experts say the balloons are just the “tip of a revolution” in the development and use of new high-altitude surveillance craft, with the UK even investing millions in a project to develop spy balloons last year.

It comes as the US military on Friday said it was tracking a suspected Chinese spy balloon that has been flying over northwestern America in recent days.

A high-altitude balloon floats over Billings in Montana but the Pentagon would not confirm whether it was the surveillance balloon
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A high-altitude balloon floats over Billings in Montana

Read more:
Chinese spy balloon flying over US airspace, says Pentagon
Spy balloon over US is actually a ‘civilian airship’, says China

A senior defence official said the US has “very high confidence” it is a Chinese high-altitude balloon and was flying over sensitive sites to collect information, while China has not immediately denied the balloon belonged to them.

Beijing admitted that the balloon had come from China, but insisted it was a “civilian airship” that had strayed into American airspace and that it was for meteorological and other scientific research.

What are spy balloons?

The devices are lightweight balloons, filled with gas, usually helium, and attached to a piece of spying equipment such as a long-range camera.

They can be launched from the ground and are sent up into the air where they can reach heights of between 60,000ft (18,000m) and 150,000ft (45,000m), above the flight paths of commercial aircraft in an area known as “near space”.

Once in the air, they travel using a mixture of air currents and pressurised air pockets, which can act as a form of steering.

Why are they still useful in the satellite era?

According to defence and security analyst Professor Michael Clarke, the biggest advantage of spy balloons over satellites are that they can study an area over a longer period of time.

Sky News' Defence Analyst Prof Michael Clarke
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Professor Michael Clarke

“The advantage is they can stay in one place for a long time,” he told Sky News.

“Because of the way the Earth rotates, unless a satellite is over the Equator, you need three to five satellites going all the time to track the same spot.

“These balloons are also relatively cheap, and much easier to launch than a satellite.”

Will balloons continue to be used in future for spying?

Very much so, according to Professor Clarke.

Despite the wide use of satellite technology, countries including the UK are also focusing on the development and use of spycraft to operate in the upper atmosphere.

In August, it was announced the Ministry of Defence had agreed a £100m deal with US defence company Sierra Nevada to provide high-altitude unmanned balloons to be used for surveillance and reconnaissance.

Professor Clarke said: “(These balloons) are the very tip of the revolution for passive upper atmosphere aircraft.”

He said other defence firms, such as BAE, were working on ultralight solar-powered drones which are able to operate in the upper atmosphere and stay in place for up to 20 months.

Why have China used them now?

According to Professor Clarke, the use of these balloons, if indeed they were launched by China, will likely have been a message to the US following its decision to open new military bases in the Philippines.

“I think it’s a challenge,” he said.

“They (China) are signalling that if the US is going to come closer to them then they will be more aggressive with their surveillance.

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Could there be a US-China war?

Watch: Future Wars: Could there ever be a conflict between the US and China?

“It is also caused a political issue in the US now, because it will be seen as a sign of weakness not to shoot it down.

“This causes some embarrassment, but the US doesn’t need to respond.”

The balloon was spotted over Billings, Montana, on Wednesday – close to one of the US’s three nuclear missile silo fields at Malmstrom Air Force Base.

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Mao Ning, a Chinese foreign ministry spokesperson, says that those involved should be ‘cool-headed’

Military and defence leaders said they considered shooting the balloon out of the sky but decided against it due to the safety risk from falling debris.

Professor Clarke added: “I think the debris issue is a bit of an excuse. It was over one of the least densely populated areas of the US and if they needed to they could have asked everyone to stay inside.

“I don’t think they wanted to make it a bigger issue, because China are daring them to shoot it down and make it an international issue.”

Spy balloon threatens efforts to ease US-China relations

Distrust between the Chinese and the Americans is as high as it’s been for decades.

An incident like this would serve to feed that distrust no matter when it happened, but coming, as it has, just days before Secretary of State Antony Blinken’s highly significant visit to Beijing could seriously undermine tentative efforts being made on both sides to try to halt any further deterioration in relations.

Mr Blinken is expected to land in Beijing on Sunday and had planned to meet his opposite number Qin Gang as well as Wang Yi, China’s highest ranking diplomat.

A huge amount of painstaking diplomatic effort will have gone into making such a visit possible – the fact it was happening at all is a progress of sorts.

In recent days there has even been suggestions Mr Blinken might meet with President Xi Jinping himself.

If so, he would be the first US secretary of state granted this level of access in five years and it would be a major sign both sides are serious about attempting to smooth over their deeply damaged relations.

The Chinese leader and US President Joe Biden both recognised when they met at the G20 summit late last year that they need to do more to ensure that their distrust and competition does not descend into conflict and confrontation.

This visit was a clear part of that effort. But mutual recognition that spiralling tensions aren’t a good thing is not the same thing as the active rebuilding of trust.

This incident will likely be seen by the Americans as flying in the face of both. And there is, perhaps, an awareness here in Beijing of just how much jeopardy this incident poses to those fledgling efforts.

Indeed, at a regular news conference in Beijing on Friday, there was a clear desire on the Chinese part to contain speculation.

Foreign ministry spokesperson Mao Ning said China was “verifying” the situation and added: “I would like to emphasise that until the facts are clarified, speculation and hype will not be helpful to the proper resolution of the issue.”

Given the low ebb of current relations between the two, Mr Blinken’s visit was not expected to deliver any breakthroughs. It was being framed more as a chance for both sides to restate their positions and red lines and keep the channels of dialogue open.

It will likely never be known if this spy balloon was purposefully scheduled ahead of the visit or if it’s just unfortunate timing, but if it forces Mr Blinken to cancel, the ramifications for the longer term project of containing deteriorating relations could be very serious indeed.

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Trump’s tariffs hit the West’s busiest port – with traffic down by nearly a third

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Trump's tariffs hit the West's busiest port - with traffic down by nearly a third

Driving south from Los Angeles along the coast, you can’t miss the San Pedro port complex. Dozens of red cranes pop up from behind the freeway.

The sound of industry whirs as containers are unloaded from hulking ocean liners on to waiting lorries and freight trains that seem to never end.

The port of Long Beach combines with the port of Los Angeles to make the busiest port in the western hemisphere.

San Pedro port complex
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The San Pedro port complex

The colourful metal containers contain anything and everything, from clothes and car parts to fridges and furniture. Around $300bn of cargo passes through here every year and 60% of it is from China.

But at the moment, it’s far less busy than usual. Traffic is down by a third, compared with this time last year.

In the closest part of the mainland United States to China, this is Donald Trump‘s new tariffs policy in action, the direct result of frozen trade between the two countries.

“For the month of May, we expect that we’ll be down about 30% from where we were in May of 2024,” Noel Hacegaba, the port of Long Beach chief operating officer, tells Sky News.

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“What that translates into is fewer ships and fewer containers. It means fewer trucks will be needed to transport those containers from the port terminal to the warehouses. It means fewer jobs.”

Noel Hacegaba, COO of the port of Long Beach
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Noel Hacegaba, chief operating officer of the port of Long Beach

‘We’re barely surviving’

Helen Andrade knows all about that. She and her husband, Javier, are both lorry drivers. Helen only got her license in the last few years, so when work dries up, she is likely to be impacted first.

“I’m lying awake at night worrying about this,” she says.

“We’re barely surviving and we’re already seeing work slowing down. In my case, there are two incomes that are not going to come in. How are we going to survive?”

Helen adds: “I’m scared for the next two weeks, because over the next two weeks, I’m going to see where this is going, whether I have saved up enough money, which I know that I have not.”

Helen Andrade
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Lorry driver Helen Andrade

In Long Beach, one in five jobs is connected to the port. But what happens in the port doesn’t stay here.

The shipments reach every part of the country and already, a shortage of certain items imported from China and price hikes are taking hold.

A short drive away is downtown LA’s toy district, a multicultural area consisting of a dozen streets of pastel-coloured buildings, home to importers and wholesalers of toys, much of which is imported from China.

Colourful balloons line windows in LA's toy district
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Colourful balloons line windows in LA’s toy district

Read more about tariffs:
Trump floats China tariff cut ahead of trade talks

China moves to ease tariff pain ahead of US talks
Federal Reserve warns of impact of Trump tariffs

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US port workers regret voting Trump

One woman in a toy warehouse is reading a Chinese newspaper. She points to a headline about the 145% tariffs.

“I can’t afford this, I can’t afford this, I’m going to have to put prices up,” she says, exasperated.

Empty shelves

Around the corner is a party shop, selling gift bags and wrapping paper. There are empty shelves which would otherwise have been full.

“These empty spaces are where we stopped importing from China because the tariffs are too high,” says the owner, Jacob Mok.

Party shop owner Jacob Mok
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Party shop owner Jacob Mok

Empty shelves in a party shop
Image:
Empty shelves in Mr Mok’s party shop

He tells Sky News: “I’ll keep watching China and America negotiations. I hope as soon as possible they reach a deal because this is very hard for us.”

Jacob is not alone. The impact is being felt throughout the supply chain.

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US trade secretary Scott Bessent will meet his Chinese counterpart in Switzerland this weekend.

Pressure is growing on Mr Trump’s team to strike a deal with China and do it quickly.

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From Chicago’s south suburbs to Rome: Dolton’s faithful say ‘Bob’ was the boy destined to be pope

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From Chicago's south suburbs to Rome: Dolton's faithful say 'Bob' was the boy destined to be pope

He was the boy from the small town with big dreams of becoming pope.

Robert Prevost, or “Bob” as they knew him in Dolton, south Chicago, was the youngest son of Louis, a teacher, and Mildred, a librarian.

Devoted in their faith, they were prominent figures in St Mary’s Church.

St Mary’s Church in Chicago, Illinois

Scott Kuzminski remembers “Millie”, the chorister, with the “voice of an angel”, and her son with a calling on his life.

“Some children dream to be the top soccer player, or rich or something, and he dreamed he was going to be the Pope,” he said.

The railroad runs through this sleepy suburb, now destined to become a place of pilgrimage.

Congratulations to Pope Leo in Chicago, Illinois
Train running through Dalton, near Chicago, Illinois

That’s an answer to prayer for Kathleen Steenson, who believed from childhood that her church would give the world a pope.

She said: “Our faith in this little parish is so strong… and in my little mind, I thought, the next pope has got to come from here because we’re such a great little community.”

Kathleen Steenson in Chicago, Illinois
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‘The next pope has got to come from here,’ Kathleen Steenson said

St Mary’s Church, where the Pope served as an altar boy before entering the priesthood, is derelict now, symbolic of the challenges.

But to many, this is holy ground, illuminated by the colours cast by the sun shining through the stained glass.

St Mary’s Church in Chicago, Illinois

And at the Cathedral of the High Name in the heart of Chicago, there’s a renewed sense of optimism.

“It’s a miracle and a great blessing,” a man leaving a celebratory mass for the new pontiff told me.

A woman, who had also been in the congregation, added: “I hope that he can help people to see beyond the divisions of the country and remember the poor.”

“It’s not just the virtues that he extols,” said another man, “I’m hoping he’ll bring inspiration to all of us to preach love and that the people in Washington will listen.”

Read more:
The Chicago-born baseball lover who made history
Pope holds first mass, hopes to help church be a beacon

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Earlier this year, Cardinal Prevost, as he was then, questioned President Trump’s stance on immigration and vice president JD Vance’s interpretation of Christianity.

Leo XIV is the first Pope from North America, but spent years as a missionary in Peru, South America.

And it’s his pastoral heart that’s giving cause for hope in a deeply divided America.

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Lawyer for Sean ‘Diddy’ Combs claims there was ‘mutual violence’ between him and ex-girlfriend

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Lawyer for Sean 'Diddy' Combs claims there was 'mutual violence' between him and ex-girlfriend

A lawyer representing Sean “Diddy” Combs has told a court there was “mutual” domestic violence between him and his ex-girlfriend Casandra ‘Cassie’ Ventura.

Marc Agnifilo made the claim as he outlined some of the music star’s defence case ahead of the full opening of his trial next week.

Combs has pleaded not guilty to one count of racketeering conspiracy, two counts of sex trafficking and two counts of
transportation for prostitution. If convicted, he faces up to life in prison.

Ms Ventura is expected to testify as a star witness for the prosecution during the trial in New York. The final stage of jury selection is due to be held on Monday morning.

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Why is Sean Combs on trial?

Mr Agnifilo told the court on Friday that the defence would “take the position that there was mutual violence” during the pair’s relationship and called on the judge to allow evidence related to this.

The lawyer said Combs‘s legal team intended to argue that “there was hitting on both sides, behaviour on both sides” that constituted violence.

He added: “It is relevant in terms of the coercive aspects, we are admitting domestic violence.”

U.S. Marshalls sit behind Sean "Diddy" Combs as he sits at the defense table alongside lawyer Marc Agnifilo in the courtroom during his sex trafficking trial in New York City, New York, U.S., May 9, 2025 in this courtroom sketch. REUTERS/Jane Rosenberg
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A court sketch showing Sean ‘Diddy’ Combs (right) as he listens to his lawyer Marc Agnifilo addressing the court. Pic: Reuters

Ms Ventura’s lawyers declined to comment on the allegations.

US District Judge Arun Subramanian said he would rule on whether to allow the evidence on Monday.

Combs, 55, was present in the court on Friday.

He has been held in custody in Brooklyn since his arrest last September.

Prosecutors allege that Combs used his business empire for two decades to lure women with promises of romantic relationships or financial support, then violently coerced them to take part in days-long, drug-fuelled sexual performances known as “Freak Offs”.

Read more:
The rise and fall of Sean ‘Diddy’ Combs

Diddy on trial: Everything you need to know
Sean Combs: A timeline of allegations

Combs’s lawyers say prosecutors are improperly seeking to criminalise his “swinger lifestyle”. They have suggested they will attack the credibility of alleged victims in the case by claiming their allegations are financially motivated.

The trial is expected to last around eight weeks.

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