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, described as being the size of three buses, 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.
US Secretary of State Antony Blinken is postponing a high-profile visit to China which had been due to begin on Sunday.
What are spy balloons?
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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.
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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0:19
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.”
This – along with reported perks such as meals sent to her dormitory room, late-night workouts and permission to shower when other inmates are in bed – have led some critics to claim she is receiving “VIP treatment”.
Image: Maxwell is now serving her sentence at Federal Prison Camp Bryan in Texas. AP file pic
Describing conditions at Federal Prison Camp Bryan, Maxwell wrote to a relative: “The food is legions better, the place is clean, the staff polite… I haven’t heard or seen the usual foul language or screaming accompanied by threats levelled by inmates by anyone.
“I have not seen a single fight, drug deal, passed out person or naked inmate running around or several of them congregating in a shower! In other words, I feel like I have dropped through Alice in Wonderland’s looking glass.”
Some of Maxwell’s new inmates have told The Wall Street Journal that they have been threatened with retaliation if they speak about her to the media – with reports suggesting at least one was transferred.
Image: Ghislaine Maxwell
Her lawyer David Oscar Markus told NBC News: “There’s nothing journalistic about publishing a prisoner’s private emails, including ones with her lawyers. That’s tabloid behaviour, not responsible reporting.
“Anyone still interested in that kind of gossip reveals far more about themselves than about Ghislaine. It’s time to get over the fact that she is in a safer facility. We should want that for everyone.”
Meanwhile, Maxwell’s brother Ian said their messages were ” private by their very nature” – and if they were sent to a reporter, “they were stolen and leaked without authorisation”.
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2:03
‘I don’t believe Epstein died by suicide’ – Maxwell
Federal Prison Camp Bryan is located in a residential area, ringed with barbed wire and houses about 635 prisoners – and Maxwell’s arrival over the summer sparked protests.
One demonstrator said back in August: “It’s brought a lot of attention to our town that we haven’t consented for. We don’t want a child sex trafficker here.”
Mr Trump told reporters at the time that he was planning to speak to the Justice Department and “would have to take a look” at whether he would consider clemency.
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1:47
Congress calls Andrew: New repercussions for royals?
Epstein died by suicide while awaiting trial on sex trafficking charges back in 2019, but pressure remains on those who had connections to the disgraced financier.
Earlier this week, the US Congress wrote to Andrew Mountbatten Windsor – who has now been stripped of his royal titles by the King – requesting an interview about his “long-standing friendship” with Epstein.
US officials have issued an emergency order banning flights of the model of plane involved in a deadly crash in Kentucky last week, pending inspection.
The Federal Aviation Administration (FAA) issued the Emergency Airworthiness Directive (AD) for McDonnell Douglas MD-11 aircraft after a UPS plane bound for Honolulu crashed on take-off in Louisville on Tuesday evening, killing 14 people. The victims included three pilots.
The FAA said the order, which came following a recommendation by its manufacturer Boeing, was prompted after “an accident where the left-hand engine and pylon detached from the airplane”.
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1:55
Fire and debris after fatal cargo plane crash
A spokesperson for the authority added: “The cause of the detachment is currently under investigation. This condition could result in the loss of continued safe flight and landing.
“The FAA is issuing this AD because the agency has determined the unsafe condition is likely to exist or develop in other products of the same type design.
“The AD prohibits further flight until the airplane is inspected and all applicable corrective actions are performed.”
The MD-11 was first manufactured by McDonnell Douglas in 1988, until its merger with Boeing in 1997.
Image: A UPS MD11 landing at Philadelphia airport in March 2025. Pic: Wikipedia/Hamproductions
It was once used by commercial airlines, including Finnair and KLM, as a passenger jet, but was retired in 2014, and is now used only as a freight plane.
Government shutdown impacts commercial flights
It came as more than 1,300 commercial flights were cancelled in the US on Saturday because of an FAA order, unrelated to the Kentucky crash, to reduce air traffic amid the ongoing government shutdown.
The deadlock in Washington has resulted in shortages of air traffic control staff, who have not been paid for weeks.
Officials have warned that the number of daily cancellations could rise in the coming days unless the political row is resolved.
Hungary has been given a one-year exemption from US sanctions on using Russian energy, a White House official has said, after its Prime Minister Viktor Orban met with Donald Trump in the White House.
Mr Orban succeeded in convincing the US president to allow Hungary to continue importing Russian oil and gas without being subject to the sanctions Mr Trump‘s administration had placed on Russian fossil fuels.
Hungary has been under heavy pressure from the European Union to end its reliance on Russian energy.
The EU has mostly heavily cut or ceased its imports of Russian oil and gas.
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2:08
Will US sanctions on Russian oil hurt the Kremlin?
Mr Orban, the country’s nationalist leader and a long-time ally of Mr Trump, has described access to Russian energy as a “vital” issue for his landlocked country.
He said he planned to discuss with Mr Trump the “consequences for the Hungarian people” if the sanctions came into effect.
Speaking at a news conference after his talks with Mr Trump, Mr Orban said Hungary had “been granted a complete exemption from sanctions” affecting Russian gas delivered to Hungary from the TurkStream pipeline and oil from the Druzhba pipeline.
“We asked the president to lift the sanctions,” Mr Orban said. “We agreed and the president decided, and he said that the sanctions will not be applied to these two pipelines.”
Mr Trump appeared to be sympathetic to Mr Orban’s pleas.
“We’re looking at it, because it’s very different for him to get the oil and gas from other areas,” he said.
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2:43
Why did Trump sanction Russian oil?
“As you know, they don’t have … the advantage of having sea. It’s a great country, it’s a big country, but they don’t have sea. They don’t have the ports.”
He added: “But many European countries are buying oil and gas from Russia, and they have been for years. And I said, ‘What’s that all about?'”
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0:47
Putin: US sanctions are an ‘unfriendly act’
Orban says ‘miracle can happen’ in Ukraine war
Mr Trump and Mr Orban also discussed the war in Ukraine, with the US president saying: “The basic dispute is they just don’t want to stop yet. And I think they will.”
The president asked Mr Orban if he thought Ukraine could win the war, with the prime minister saying a “miracle can happen”.
Hungary reliant on Russian gas and oil
As part of the discussions, Hungary agreed to buy US liquefied natural gas (LNG), the US state department said, noting contracts were expected to be worth around $600m (£455m).
The two nations also agreed to work together on nuclear energy, including small modular reactors.
Mr Orban also said Hungary will also purchase nuclear fuel from the US-based Westinghouse Electric Company to power its Paks nuclear plant, which has until now relied on Russian-supplied nuclear fuel.
International Monetary Fund figures show Hungary relied on Russia for 74% of its gas and 86% of its oil last year. It warned an EU-wide cutoff of Russian natural gas could result in output losses in Hungary exceeding 4% of its GDP.