"They made a mistake," "horrible thing'"— Trump reacts to Russia's Sumy strike

U.S. President Donald Trump called Russia's deadly attack against Sumy on April 13 "terrible" but claimed Moscow made a "mistake," without elaborating on how he came to the conclusion.

"I think it was terrible, and I was told they made a mistake, but I think it's a horrible thing. I think the whole war is a horrible thing... for that war to have started is an abuse of power," Trump said.

"This is (former U.S. President Joe) Biden's war. This is not my war; I've been here for a very short period of time. This is a war that was under Biden. He gave them billions and billions of dollars," Trump said, adding Biden should have never "allowed" the war to start.

Russia targeted Sumy in a deadly attack on April 13, killing at least 34 and leaving 117 people injured. European leaders condemned the Palm Sunday attack, describing it as appalling and "heartbreaking."