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We'll be back soon with all the latest from the war in Ukraine.

Until then, here's a rundown of what's happened during the last 24 hours:

• Ukraine says it was faced with Russia's largest overnight bombardment of the war so far last night;
• It said nearly 500 missiles and drones were launched at the country, though no deaths were reported by Ukraine's emergency services;
• Poland and its allies scrambled jets after attacks were recorded in western Ukraine near the Polish border;
• Elsewhere, the first stage of a prisoner swap between Moscow and Kyiv got underway after accusations from both sides that the other was trying to delay the exchange;
• Volodymyr ZelenAG百家乐在线官网y said the first group returning to Ukraine were the wounded and seriously wounded, as well as those under 25;
• Ukraine's army says it managed to damage two Russian jets during an overnight raid on an air base 400 miles past the border;
• It also said its drones damaged a warehouse 800 miles into Russia that creates navigation parts for Russian drones and missiles.

The secretary general of NATO will call for a 400% increase in funding for air and missile defences, during a speech in London today.

Mark Rutte has met with Sir Keir Starmer and John Healey, the defence secretary, this afternoon.

It comes ahead of a summit in The Hague later this month, when the UK and its NATO allies are expected to agree to pledge to spend 5% of GDP on defence and related areas.

Currently, the government is committed to spend 2.5% GDP on defence from April 2027, with a goal of increasing this to 3% over the next parliament. 

Sky News understands the government will in fact increase defence spending to 3.5% of GDP within a decade to keep the US on side.

'Hope is not a strategy'

Speaking at Chatham House, Rutte will call for a "quantum leap in our collective defence".

He will say that "danger will not disappear even when the war in Ukraine ends".

The call for a 400% increase in air and missile defence will come because of how Russia "delivers terror from above".

Russia has released a video showing what it says are its soldiers being released by Ukrainian forces during the latest prisoner swap with Kyiv.

The Russian defence ministry said the soldiers were under the age of 25 and had boarded a bus at an unknown location in Belarus.

Earlier, Ukraine shared images of its own prisoners being released (see 1.02pm post),

We reported this morning on a Ukrainian drone attack that hit a Russian electronics company 800 miles into the country.

The Ukrainian military said the VNIIR-Progress factory in Cheboksary manufactures navigation equipment used in attack drones, guided aerial bombs and high-precision weapons. 

The video below shows the moment of the attack, with explosions seen after a drone drops onto the building.

Vladimir Putin has approved a new naval strategy aiming to fully restore Russia's position as one of the world's leading maritime powers, according to a Kremlin aide.

Russia has the world's third most powerful navy after China and the United States, according to most public rankings, though the navy has suffered a series of high-profile losses in Ukraine.

Nikolai Patrushev, a former KGB officer who served with Putin in St Petersburg during Soviet times, said the new naval strategy had been approved by Putin in late May.

"Russia's position as one of the world's greatest maritime powers is gradually recovering," Patrushev told the Russian weekly Argumenti i Fakti newspaper.

Patrushev gave no further details about the strategy, though Russia has ramped up spending on defence and security to Cold War levels as a percentage of gross domestic product.

Volodymyr ZelenAG百家乐在线官网y says the first group of Ukrainians have returned home from captivity as part of the latest exchange with Russia.

Both Moscow and Kyiv spent the last few days accusing each other of stalling the exchange, which was agreed during direct talks in Istanbul last week.

Posting on social media, ZelenAG百家乐在线官网y said the exchange will continue in several stages in the coming days. 

He added the first group returning were the wounded and seriously wounded, as well as those under 25.

"The process is quite complicated, with many sensitive details, and negotiations continue virtually every day," ZelenAG百家乐在线官网y says.

"We are doing our utmost to return everyone. We are working for this at all levels. We must bring home everyone who is in captivity. Thank you to everyone who is helping."

Earlier, Russia said it had heard "a hundred different excuses" over why the exchange had not taken place already, with Kyiv saying it had not received the full list of prisoners to be released (see 11.07am post).

Oleksandr Usyk has issued an invitation to Donald Trump to spend a week at his home in Ukraine to gain an insight into the war with Russia.

The former boxer, an undisputed world champion in both the cruiserweight and heavyweight divisions, said Trump needs to develop a more profound understanding of the situation.

"I offer him my home. Let him come to Ukraine. I will give him my home and my security guards. I will ensure his complete safety," Usyk told CNN. "Let him live in my house for a week and see how rockets fly over it and how people live in Ukraine.

"And when he comes secretly, let him live somewhere in (the Kyiv districts of) Obolon or Troyeshchyna, where houses, residential buildings are being bombed. Then he will understand what is happening."

Trump has previously asserted he could resolve the war within 24 hours of taking office, though this did not happen. 

"He should be responsible for the words he said," Usyk added. 

"He said that in a month or a day he would stop this war. He is not responsible for his words. Why does he speak?"

Here are the latest images from Ukraine following last night's huge Russian aerial attacks.

They show the scenes in Zaporizhzhia, southeast Ukraine, where police examine the aftermath of a strike that destroyed a building.

Following reports from Ukraine that Russia launched its biggest overnight attack of the war last night (see 9.48am post), Sky News spoke with military analyst Professor Michael Clarke about the effectiveness of such attacks.

He tells presenter Gareth Barlow that the level of damage that can be inflicted cannot be underestimated. 

He points out that even though Ukraine's air force diverted dozens of drones using electronic warfare, the explosive warheads on them will still detonate when they land.

However, Clarke explains that overnight drone attacks on cities have a larger effect on morale than on tactical battlefield results.

"Is it making a strategic difference? Probably not," he says.

"The things that make a difference for the Russians are the glide bombs - things that can affect the front lines.

"The drones are certainly bringing misery to the civilian population because they're forcing them to spend nights in the air raid shelters and in the tube stations in Kyiv rather than at home. So it has a morale effect."

Ukrainian special forces claim to have damaged two fighter jets during a raid on an airfield deep inside Russia.

Ukraine's army said special operations forces launched an assault on the Savasleyka air base, located in the Nizhny Novgorod region of Russia, about 400 miles from the Ukrainian border.

It claims the airfield is used by Russia to deploy MiG-31K fighters carrying ballistic missiles which have been used against Ukrainian armed forces and its cities.

The attack comes one week after Operation Spider's Web, where Ukraine launched a surprise drone attack on Russia's bomber fleet.