US President Donald Trump on Friday announced on social media that there would be a three-day ceasefire in the war between Russia and Ukraine from May 9 until May 11 to mark the end of World War II for the Russians.

Trump had said after a phone call with Putin on April 29 that a temporary ceasefire was in the works. Putin announced a similar truce last year that lasted three days ​but was not agreed with Kyiv.

Trump said in a Truth Social post that the pause will include a suspension of all kinetic activity, and also a prison swap of 1,000 prisoners from each country.

“Hopefully, it is the beginning of the end of a very long, deadly, and hard-fought War,” he said, adding that there was constant progress in talks to end the conflict.

Russia announced a ceasefire for May 8 to 9 to coincide with commemorations of the Soviet Union’s victory over Nazi Germany in World War Two and a military parade in Moscow’s Red Square.

Ukraine announced its own proposal for an open-ended ceasefire that started at midnight on Tuesday (9pm GMT), urging Russia to reciprocate.

Officials said on Thursday that Ukraine’s top ​negotiator, Rustem Umerov, had arrived in Miami for a series of meetings with US ‌representatives as peace talks on ending Russia’s war in Ukraine have stalled in recent months.

The US-brokered talks ⁠are deadlocked over Ukraine’s eastern Donetsk region. Moscow demands Kyiv pull troops back from parts ​of the region it has failed to capture in its four-year full-scale invasion. Ukraine says it ​will not cede land that it controls.

Moscow and Kyiv have both accused each other of violating ceasefires that each has separately declared.

Ukrainian President Volodymyr Zelenskiy on Friday confirmed a three-day ceasefire had been arranged with Russia as part of US efforts to negotiate an end to the more than four-year-old war.

Zelenskiy, writing on Telegram, also said each of the two sides would be exchanging 1,000 prisoners of war, with humanitarian issues remaining a key Ukrainian priority.

“That is why today, within the framework of the negotiation process mediated by the American side, we received Russia’s agreement to conduct a prisoner of war exchange in the format of 1,000 for 1,000,” Zelenskiy wrote.

“A ceasefire is also to be established on May 9, 10, 11.”

Russia has agreed to Trump’s initiative for a ceasefire with Ukraine from May 9 to May 11 and to carry out a prisoner exchange with Kyiv during that period, Kremlin aide Yuri Ushakov said on Friday.