The president made quickly stopping the war one of his diplomatic priorities, and has increasingly expressed frustration about Russian president Vladimir Putin’s unbudging stance on US-led peace efforts.
Mr Trump has long boasted of his friendly relationship with Mr Putin and after taking office in January repeatedly said that Russia was more willing than Ukraine to reach a peace deal.
At the same time, Mr Trump accused Mr Zelensky of prolonging the war and called him a “dictator without elections”.
But Russia’s relentless onslaught against civilian areas of Ukraine wore down Mr Trump’s patience. In April, he urged Mr Putin to “STOP!” launching deadly barrages on Kyiv, and the following month he said in a social media post that the Russian leader “has gone absolutely CRAZY!” as the bombardments continued.
“I am very disappointed with President Putin, I thought he was somebody that meant what he said,” Mr Trump said late on Sunday.
“He’ll talk so beautifully and then he’ll bomb people at night. We don’t like that.”
