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.
Image: A high-altitude balloon floats over Billings in Montana
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.
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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.
Image: 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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“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.
Sir Keir Starmer will join world leaders at a historic summit in Egypt today – to witness the signing of the Gaza peace plan to end two years of conflict, bloodshed and suffering that has cost tens of thousands of lives and turned Gaza into a wasteland.
Travelling over to Egypt, flanked by his national security adviser Jonathan Powell, the prime minister told me it was a “massive moment” and one that is genuinely historic.
In the flurry of the following 48 hours, Sir Keir and another 20 or so leaders were invited to Egypt to bear witness to the signing of this deal, with many of them deserving some credit for the effort they made to bring this deal around – not least the leaders of Qatar, Egypt and Turkey, who pressed Hamas to sign up to this deal.
Today, the remaining 20 living hostages are finally set to be released, along with the bodies of another 28 who were either killed or died in captivity, and aid is due to flow back into a starving Gaza.
Some 1,200 Israelis were killed on 7 October 2023, with another 250 taken hostage. In the subsequent war, most of Gaza’s two million population has been displaced. More than 67,000 Gazans have been killed, according to Palestinian health officials.
Then, the signing ceremony is due to take place this afternoon in Sharm el Sheikh. It will be a momentous moment after a long and bloody war.
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But it is only just the beginning of a long process to rebuild Gaza and try to secure a lasting peace in the region.
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Humanitarian aid rolls into Gaza
The immediate focus for the UK and other nations will be to get aid into Gaza, with the UK committing £20m for water, sanitation and hygiene services for Gazans.
But the focus for the UK and other European allies is what happens after the hostages are released and Israel withdraws its troops.
What happens next is a much bigger and more complicated task: rebuilding Gaza; turning it into a terrorist-free zone; governing Gaza – the current plan is for a temporary apolitical committee; creating an international stabilisation force and all the tensions that could bring about – which troops each side would allow in; a commitment for Israel not to occupy or annex Gaza, even as Netanyahu makes plain his opposition to that plan.
The scale of the challenge is matched by the scale of devastation caused by this brutal war.
The prime minister will set out his ambition for the UK to play a leading role in the next phase of the peace plan.
Image: Starmer arrives in Sharm el-Sheikh. Pic: PA
Back home, the UK is hosting a three-day conference on Gaza’s recovery and reconstruction.
Last week, France hosted European diplomats and key figures from Middle Eastern countries, Egypt, Jordan, Saudi Arabia and Qatar – and later this week, the German chancellor is hoping to organise a conference on the reconstruction of Gaza with the Egyptians.
But in reality, European leaders know the key to phase two remains the key to phase one, and that’s Donald Trump.
As one UK figure put it to me over the weekend: “There is lots of praise, rightly, for the US president, who got this over the line, but the big challenge for us post-war is implementing the plan. Clearly, Arab partners are concerned the US will lose focus.”
Image: Bridget Phillipson and Mike Huckabee. Pics: Sky/AP
The prime minister knows this and has made a point, at every point, to praise Mr Trump.
His cabinet minister Bridget Phillipson learned that diplomatic lesson the hard way yesterday when she was publicly lambasted by the US ambassador to Israel Mike Huckabee for suggesting to my colleague Trevor Phillips that the UK “had played a key role behind the scenes” and failed to mention Mr Trump by name.
“I assure you she is delusional,” tweeted Governor Huckabee. “She can thank @realDonaldTrump anytime just to set the record straight”.
Today, leaders will rightly be praising Mr Trump for securing the breakthrough to stop the fighting and get the remaining hostages home.
Image: People hug next in Hostages Square. Pic: Reuters
But this is only the beginning of a very long journey ahead to push through the rest of the 19-point plan and stop the region from falling back into conflict.
Britain has, I am told, been playing a role behind the scenes. The PM’s national security adviser Mr Powell was in Egypt last week and has been in daily touch with his US counterpart Steve Witkoff, according to government sources. Next week the King of Jordan will come to the UK.
Part of the UK’s task will be to get more involved, with the government and European partners keen to get further European representation on Trump’s temporary governance committee for Gaza, which Tony Blair (who was not recommended or endorsed by the UK) is on and Mr Trump will chair.
The committee will include other heads of states and members, including qualified Palestinians and international experts.
As for the former prime minister’s involvement, there hasn’t been an overt ringing endorsement from the UK government.
It’s helpful to have Mr Blair at the table because he can communicate back to the current government, but equally, as one diplomatic source put it to me: “While a lot of people in the Middle East acknowledge his experience, expertise and contact book, they don’t like him and we need – sooner rather than later – other names included that Gulf partners can get behind.”
Today it will be the US, Egypt, Qatar and Turkey that sign off on the peace plan they directly negotiated, as other Middle Eastern and European leaders, who have flown into Sharm el Sheikh to bear witness, look on.
But in the coming days and weeks, there will need to be a big international effort, led by Mr Trump, not just to secure the peace, but to keep it.
The world turns to the Middle East as hostages held by Hamas are returned to their families in Israel on Monday after over two years in captivity.
Thousands of Palestinian prisoners will also be released from Israeli prisons in exchange.
Mark Stone is in Sharm el Sheikh, Egypt, and Dominic Waghorn is in Jerusalem, Israel, as President Trump flies first to Israel to speak at the Israeli Parliament and celebrate the return of the hostages, before he flies to the Sinai Peninsula.
Dozens of world leaders will follow him to Sharm el Sheikh to witness a peace summit that many hope is the start of true peace in the Middle East.
Actress Diane Keaton, who starred in films including The Godfather and Annie Hall, has died aged 79.
Keaton’s daughter, Dexter Keaton White, confirmed her death in California to Sky’s US partner network NBC News.
With a long career, across a series of movies that are regarded as some of the best ever made, Keaton was widely admired.
She was awarded an Oscar, a BAFTA and two Golden Globe Awards, and was also nominated for two Emmys, and a Tony, as well as picking up a series of other Academy Award and BAFTA nominations.
Image: Diane Keaton, with her best actress Oscar for Annie Hall in 1978. Pic: AP
Her best actress Oscar was for the Woody Allen film Annie Hall, which is said to be loosely based on her life.
She appeared in several other Allen projects, including Manhattan, as well as all three Godfather movies, in which she played Kay, the wife and then ex-wife of Marlon Brando’s son Michael Corleone, played by Al Pacino, opposite him as he descends into a life of crime and replaces his father in the family’s mafia empire.
Image: With Woody Allen in 1978. Pic: Adam Scull/PHOTOlink.net/AP
Keaton was the kind of actor who helped make films iconic and timeless, from her heartbreaking turn as Kay Adams-Corleone to the “La-dee-da, la-dee-da” phrasing as Annie Hall, bedecked in the now famous necktie, bowler hat, vest and khakis.
Keaton also frequently worked with Nancy Meyers, starting with 1987’s Baby Boom.
Their other films together included 1991’s Father Of The Bride and its 1995 sequel, as well as 2003’s Something’s Gotta Give.
Image: Keaton (centre) with Goldie Hawn (L) and Bette Midler at the premiere of The First Wives Club in 1996. Pic: AP
In 1996, she starred opposite Goldie Hawn and Bette Midler in The First Wives Club, about three women whose husbands had left them for younger women.
More recently, she collaborated with Jane Fonda, Mary Steenburgen and Candice Bergen on the Book Club films.
‘Brilliant, beautiful’
The unexpected news of Keaton’s death was met with shock around the world.
Image: Diane Keaton shows her hands after placing them on fresh cement during a ceremony TCL Chinese Theatre in 2022. Pic: Reuters
Her First Wives Club co-star Midler wrote on Instagram: “The brilliant, beautiful, extraordinary Diane Keaton has died. I cannot tell you how unbearably sad this makes me.
“She was hilarious, a complete original, and completely without guile, or any of the competitiveness one would have expected from such a star. What you saw was who she was … oh, la, lala!”
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Fellow co-star Goldie Hawn said Keaton had left “a trail of fairy dust, filled with particles of light and memories beyond imagination”.
“How do we say goodbye? What words can come to mind when your heart is broken? You never liked praise, so humble, but now you can’t tell me to ‘shut up’ honey. There was, and will be, no one like you,” Hawn added in a post on Instagram.
“You stole the hearts of the world and shared your genius with millions, making films that made us laugh and cry in ways only you could.”
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Actor Ben Stiller paid tribute on X, writing: “Diane Keaton. One of the greatest film actors ever. An icon of style, humor and comedy. Brilliant. What a person.”
Kate Hudson, Goldie Hawn’s daughter, posted simply: “We love you so much Diane.”
Image: Last year at New York Fashion Week. Pic: AP
In her Instagram tribute, Emmy, Grammy, Oscar, and Tony award-winning actress and producer Viola Davis said: “No!! No!!! No!! God, not yet, NO!!! Man… you defined womanhood.
“The pathos, humor, levity, your ever-present youthfulness and vulnerability – you tattooed your SOUL into every role, making it impossible to imagine anyone else inhabiting them.
“You were undeniably, unapologetically YOU!!! Loved you. Man… rest well. God bless your family, and I know angels are flying you home.”
Image: Diane Keaton and her children, Duke (left) and Dexter Keaton, at the premiere of ‘Book Club’ in 2018. Pic: AP
Keaton never married.
She adopted her daughter Dexter at the age of 50 in 1996 and a son, Duke, four years later.