US President Donald Trump has said he is "not happy" with his Russian counterpart Vladimir Putin, following Moscow's largest aerial attack yet on Ukraine, BBC reported.
In a rare rebuke, Trump said: "What the hell happened to him? He's killing a lot of people." He later called Putin "absolutely crazy".
Ukrainian President Volodymyr Zelensky earlier said Washington's "silence" over recent Russian attacks was encouraging Putin, urging "strong pressure" - including tougher sanctions - on Moscow.
At least 12 people were killed and dozens injured in Ukraine overnight Sunday after Russia fired 367 drones and missiles - the highest number in a single night since Putin launched a full-scale invasion in 2022, according to BBC.
