These are the main aspects of the deal set out by the US:
• The US and Russia have agreed to safe navigation in the Black Sea, which had been a key focus of talks this week • Additionally, they agreed to work together on measures banning strikes on energy infrastructure in Russia and Ukraine • Washington will also help to restore Russia’s access to global markets for agricultural and fertiliser exports, the White House said – although where this leaves Western sanctions against Russia is unclear at this stage.
The US also said it has agreed it will remain committed to returning forcibly transferred Ukrainian children.
Ukraine’s defence minister Rustem Umerov confirmed the agreement, but added that Kyiv maintains any movement by Russian military vessels outside of eastern part of the Black Sea will constitute violation of the spirit of this agreement.
“In this case Ukraine will have full right to exercise right to self-defence,” he said.
He added: “All parties agreed to develop measures for implementing the presidents’ agreement to ban strikes against energy facilities of Ukraine and Russia.”
The Kremlin has confirmed that it has agreed to the ceasefire but there has been a disagreement over the timing and conditions.
While Volodymyr Zelenskyy said he understood the ceasefire would start immediately after the US announcement, Moscow has countered, saying it will only come into force after Western sanctions are lifted against companies involved in food and fertiliser exports.
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He says Russia will be quite happy dragging the US through peace talks without making any meaningful concessions.
The deal is one the US “can boast about” – without it changing much on the ground for Ukraine, he says.
“The Russians will be quite happy about that because they’ll just keep going down more and more rabbit holes and they’ll present little gains for the US,” he explains.
“But they won’t address the central issue,” he says.
No real deal can be agreed unless Donald Trump starts putting meaningful pressure on Vladimir Putin, he says.
Image: A Ukrainian patrol boat in the Black Sea in 2024. Pic: Reuters
“Unless the Americans are prepared to pressure Russia as opposed to just keeping offering them more advantages, the war will just go on.”
He also says Mr Trump will stay interested until it “gets difficult”, at which point he’ll “just go onto something else”.
“He’s a disrupter, but when disruption becomes hard to follow through, he goes on to the next topic, and I think that’s what will happen.”
Why is Russia willing to agree to a ceasefire at sea now?
Under the ceasefire at sea, Russia would once again be able to export farm produce and fertiliser through the Black Sea, getting relief from sanctions imposed by Western countries.
The US even referred to helping Russia access the world market again for agricultural products in its statement.
According to Prof Clarke, Russia is happy to continue fighting on land, where it is slowly making gains, while signing up to something that protects its ships at sea – where Ukraine has been growing in confidence and damaging Russian vessels.
And it helps with Russia’s goal of getting its equipment out of the Black Sea.
Today’s agreement has come in the midst of negotiations between Russia, the US and Ukraine in Riyadh in recent days centred on the Black Sea.
But the basis of the negotiations was a deal to secure shipping there that collapsed more than 18 months ago.
That UN-backed deal was negotiated in July 2022 between Turkey, the UN and Russia as a way of ensuring that Ukraine, one of the breadbaskets of the world, could keep exporting grain via its southern ports without being attacked.
It was known as the Black Sea grain initiative.
That deal benefited Russia, as it also allowed for greater Russian agricultural exports – but but Moscow pulled out of the initiative in July 2023 after accusing the West of reneging on this part of the agreement.
This meant Russia stopped granting safe passage to cargo ships going to and from Ukraine, and the country’s grain exports subsequently slumped.
But Russia is now said to be keen to revive parts of the grain deal.
What happened the last time Ukraine and Russia had a ceasefire agreement?
Last week, Mr Putin agreed to an immediate 30-day pause in strikes on Ukrainian energy infrastructure.
However, within 24 hours Ukraine and Russia accused the other of breaking the pledge.
Donald Trump has criticised Vladimir Putin and suggested a shift in his stance towards the Russian president after a meeting with Volodymyr Zelenskyy before the Pope’s funeral.
The Ukrainian president said the one-on-one talks could prove to be “historic” after pictures showed him sitting opposite Mr Trump, around two feet apart, in the large marble hall inside St Peter’s Basilica.
The US president said he doubted his Russian counterpart’s willingness to end the war after leaving Rome after the funeral of Pope Francis at the Vatican.
In a post on his Truth Social platform, he said “there was no reason” for the Russian president “to be shooting missiles into civilian areas, cities and towns, over the last few days”.
Image: The two leaders held talks before attending the Pope’s funeral
He added: “It makes me think that maybe he doesn’t want to stop the war, he’s just tapping me along, and has to be dealt with differently, through ‘Banking’ or ‘Secondary Sanctions?’ Too many people are dying!!!”
The meeting between the US and Ukrainian leaders was their first face-to-face encounter since a very public row in the Oval Office in February.
Mr Zelenskyy said he had a good meeting with Mr Trump in which they talked about the defence of the Ukrainian people, a full and unconditional ceasefire, and a durable and lasting peace that would prevent the war restarting.
Other images released by the Ukrainian president’s office show Sir Keir Starmer and French President Emmanuel Macron were present for part of the talks, which were described as “positive” by the French presidency.
Mr Zelenskyy‘s spokesman said the meeting lasted for around 15 minutes and he and Mr Trump had agreed to hold further discussions later on Saturday.
Image: The world leaders shared a moment before the service
Image: Donald Trump and Volodymyr Zelenskyy meet in the Basilica
But the US president left Rome for Washington on Air Force One soon after the funeral without any other talks having taken place.
The Ukrainian president’s office said there was no second meeting in Rome because of the tight schedule of both leaders, although he had separate discussions with Mr Starmer and Mr Macron.
The French president said in a post on X “Ukraine is ready for an unconditional ceasefire” and that a so-called coalition of the willing, led by the UK and France, would continue working to achieve a lasting peace.
There was applause from some of the other world leaders in attendance at the Vatican when Mr Zelenskyy walked out of St Peter’s Basilica after stopping in front of the pontiff’s coffin to pay his respects.
Image: Donald Trump and the Ukrainian president met for the first time since their Oval Office row. Pic: Reuters
Sir Tony Brenton, the former British ambassador to Russia, said the event presents diplomatic opportunities, including the “biggest possible meeting” between Mr Trump and the Ukrainian leader.
He told Sky News it could mark “an important step” in starting the peace process between Russia and Ukraine.
Professor Father Francesco Giordano told Sky News the meeting is being called “Pope Francis’s miracle” by members of the clergy, adding: “There’s so many things that happened today – it was just overwhelming.”
The bilateral meeting comes after Mr Trump’s peace negotiator Steve Witkoff held talks with Mr Putin at the Kremlin.
They discussed “the possibility of resuming direct negotiations between Russia and Ukraine”, Kremlin aide Yuri Ushakov said.
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On an extraordinary day, remarkable pictures on the margins that capture what may be a turning point for the world.
In a corner of St Peter’s Basilica before the funeral of Pope Francis, the leaders of America and Ukraine sit facing each other in two solitary chairs.
They look like confessor and sinner except we cannot tell which one is which.
In another, the Ukrainian president seems to be remonstrating with the US president. This is their first encounter since their infamous bust-up in the Oval Office.
Image: The two leaders held talks before attending the Pope’s funeral
Other pictures show the moment their French and British counterparts introduced the two men. There is a palpable sense of nervousness in the way the leaders engage.
We do not know what the two presidents said in their brief meeting.
But in the mind of the Ukrainian leader will be the knowledge President Trump has this week said America will reward Russia for its unprovoked brutal invasion of his country, under any peace deal.
Mr Trump has presented Ukraine and Russia with a proposal and ultimatum so one-sided it could have been written in the Kremlin.
Kyiv must surrender the land Russia has taken by force, Crimea forever, the rest at least for now. And it must submit to an act of extortion, a proposed deal that would hand over half its mineral wealth effectively to America.
Image: The world leaders shared a moment before the service
Afterwards, Zelenskyy said it had been a good meeting that could turn out to be historic “if we reach results together”.
They had talked, he said, about the defence of Ukraine, a full and unconditional ceasefire and a durable and lasting peace that will prevent a war restarting.
The Trump peace proposal includes only unspecified security guarantees for Ukraine from countries that do not include the US. It rules out any membership of Ukraine.
Ukraine’s allies are watching closely to see if Mr Trump will apply any pressure on Vladimir Putin, let alone punish him for recent bloody attacks on Ukraine.
Or will he simply walk away if the proposal fails, blaming Ukrainian intransigence, however outrageously, before moving onto a rapprochement with Moscow.
If he does, America’s role as guarantor of international security will be seen effectively as over.
This could be the week we see the world order as we have known it since the end of the Second World War buried, as well as a pope.