Russia and Ukraine conducted a significant prisoner exchange on Sunday, just hours following one of the largest aerial attacks by Moscow during the over three-year conflict between the nations.

The prisoner swap was the third and final part of a major exchange, marking a rare moment of cooperation. 

The Russian Defense Ministry reported that more than 300 soldiers were exchanged by both sides. This event occurred after 307 combatants and civilians were freed by each country on Saturday, and 390 on Friday — marking the most extensive exchange of the war to date.

“303 Ukrainian defenders are home,” Ukraine’s President Volodymyr Zelenskyy wrote on X, confirming the exchange. 

“I’m not happy with what Putin is doing,” Trump said. “He’s killing a lot of people, and I don’t know what the hell happened to Putin.” 

Later expanding on his comments in a Truth Social Post, Trump said Putin had “gone absolutely CRAZY!” 

“I’ve always said that [Putin] wants ALL of Ukraine, not just a piece of it, and maybe that’s proving to be right, but if he does, it will lead to the downfall of Russia!” the social media post read. But the president also criticized Zelenskyy.   

“Likewise, President Zelenskyy is doing his Country no favors by talking the way he does. Everything out of his mouth causes problems, I don’t like it, and it better stop,” Trump wrote, concluding: “This is a War that would never have started if I were President. This is Zelenskyy’s, Putin’s, and Biden’s War, not ‘Trump’s,’ I am only helping to put out the big and ugly fires, that have been started through Gross Incompetence and Hatred.” 

Fox News Digital’s Andrea Margolis and The Associated Press contributed to this report.