What are spy balloons and why could they play a key role in the future of aerial reconnaissance?
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.
On Saturday, the US shot down a suspected Chinese spy balloon that had been flying over its airspace.
A senior defence official had previously said the US has “very high confidence” it was 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.
The Pentagon acknowledged reports of a second balloon that was spotted flying over Latin America, saying: “We now assess it is another Chinese surveillance balloon”.
A high-altitude balloon floats over Billings in Montana
The sightings prompted US Secretary of State Antony Blinken to postpone a high-profile visit to China which had been due to begin on Sunday, while the Pentagon accused Beijing of spying on sensitive military sites.
Beijing admitted that the initial 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.
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 initially decided against shooting down the balloon 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.”
US
Donald Trump plans to hit Canada with new tariff – while warning of blanket hike for other countries
Donald Trump has said he plans to hit Canada with a 35% tariff on imported goods, as he warned of a blanket 15 or 20% hike for most other countries.
In a letter to Canadian Prime Minister Mark Carney, the US president wrote: “I must mention that the flow of Fentanyl is hardly the only challenge we have with Canada, which has many Tariff, and Non-Tariff, Policies and Trade Barriers.”
Mr Trump’s tariffs were allegedly an effort to get Canada to crack down on fentanyl smuggling, and the US president has expressed frustration with Canada’s trade deficit with the US.
In a statement Mr Carney said: “Throughout the current trade negotiations with the United States, the Canadian government has steadfastly defended our workers and businesses. We will continue to do so as we work towards the revised deadline of August 1.”
He added: “Canada has made vital progress to stop the scourge of fentanyl in North America. We are committed to continuing to work with the United States to save lives and protect communities in both our countries.”
Mr Trump has sent a series of tariff letters to 23 countries so far, including one putting a 50% tariff on Brazil in part for the ongoing trial of its former president Jair Bolsonaro for trying to stay in office after he lost the election in 2022.
Mr Trump was similarly indicted for his efforts to overturn his election loss in 2020.
The higher rates would go into effect on 1 August.
Shortly after Mr Trump unveiled his “Liberation Day” tariffs on 2 April, there was a huge sell-off on the financial markets. The US president later announced a 90-day negotiating period, during which a 10% baseline tariff would be charged on most imported goods.
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But in an interview with Sky News’s partner network NBC News, Mr Trump said he plans to impose higher blanket tariffs on most US trade partners.
“We’re just going to say all of the remaining countries are going to pay, whether it’s 20% or 15%. We’ll work that out now,” he said.
He added: “I think the tariffs have been very well-received. The stock market hit a new high today.”
The US and UK signed a trade deal in June, with the US president calling it “a fair deal for both” and saying it will “produce a lot of jobs, a lot of income”.
Sir Keir Starmer said the document “implements” the deal to cut tariffs on cars and aerospace, adding: “So this is a very good day for both of our countries – a real sign of strength.”
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The US president also teased a “major statement” he will make on Russia over its war with Ukraine.
“I’m disappointed in Russia, but we’ll see what happens over the next couple of weeks,” he said.
“I think I’ll have a major statement to make on Russia on Monday.”
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It comes as Russia’s deputy foreign minister, Sergei Ryabkov, said a new round of talks between Moscow and Washington on bilateral problems could take place before the end of the summer.
A Palestinian activist who was detained for over three months in a US immigration jail after protesting against Israel is suing Donald Trump’s administration for $20m (£15m) in damages.
Lawyers for Mahmoud Khalil have filed a claim against the administration alleging he was falsely imprisoned, maliciously prosecuted and smeared as an antisemite as the government sought to deport him over his role in campus protests.
The 30-year-old graduate student at Columbia University told Sky News’s lead world presenter Yalda Hakim being detained by ICE agents in March “felt like kidnapping”.
He described “plain-clothed agents and unmarked cars” taking him “from one place to another, expecting you just to follow orders and shackled all the time”, which he said was “really scary”.
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Mahmoud Khalil reunites with family after release
Mr Khalil said he was not presented with an arrest warrant and wasn’t told where he was being taken.
He said the detention centre he was taken to was “as far from humane as it could be” and “a place where you have no rights whatsoever”.
“You share a dorm with over 70 men with no privacy, with lights on all the time, with really terrible food. You’re basically being dehumanised at every opportunity. It’s a black hole,” he added.
Mr Khalil said he would also accept an official apology from the Trump administration.
The Trump administration celebrated Mr Khalil’s arrest, promising to deport him and others whose protests against Israel it declared were “pro-terrorist, antisemitic, anti-American activity”.
Mr Khalil said after around 36 hours in captivity he was allowed to speak to his wife, who was pregnant at the time.
“These were very scary hours, I did not know what was happening on the outside. I did not know that my wife was safe,” he said.
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‘Absolutely absurd allegations’
Mr Khalil said administration officials had made “absolutely absurd allegations” by saying he as involved in antisemitic activities and supporting Hamas.
“They are weaponising antisemitism, weaponising anti-terrorism in order to stifle speech,” he said. “What I was engaged in is simply opposing a genocide, opposing war crimes, opposing Columbia University’s complicity in the war on Gaza.”
A State Department spokesperson said its actions toward Mr Khalil were fully supported by the law.
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Asked about missing the birth of his son while he was in prison, Mr Khalil said: “I don’t think there’s any word that can describe the agony and the sadness that I went through, to be deprived from such a divine moment, from a moment that my wife and I had always dreamed about.”
Meanwhile, the deportation case against Mr Khalil is continuing to wind its way through the immigration court system.
Donald Trump has praised the Liberian president’s command of English – the West African country’s official language.
The US president reacted with visible surprise to Joseph Boakai’s English-speaking skills during a White House meeting with leaders from the region on Wednesday.
After the Liberian president finished his brief remarks, Mr Trump told him he speaks “such good English” and asked: “Where did you learn to speak so beautifully?”
Mr Trump seemed surprised when Mr Boakai laughed and responded he learned in Liberia.
The US president said: “It’s beautiful English.
“I have people at this table who can’t speak nearly as well.”
Mr Boakai did not tell Mr Trump that English is the official language of Liberia.
The country was founded in 1822 with the aim of relocating freed African slaves and freeborn black citizens from the US.
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Mr Trump promised the leaders of Liberia, Senegal, Gabon, Mauritania and Guinea-Bissau a pivot from aid to trade at the surprise meeting.
He described the countries as “all very vibrant places with very valuable land, great minerals, and great oil deposits, and wonderful people”.
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Later asked by a reporter if he’ll visit the continent, Mr Trump said, “At some point, I would like to go to Africa.”
But he added that he’d “have to see what the schedule looks like”.
Trump’s predecessor, President Joe Biden, promised to go to Africa in 2023, but only fulfilled the commitment by visiting Angola in December 2024, just weeks before he left office.
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