U.S. President Donald Trump warned Vladimir Putin Tuesday that he was "playing with fire," taking a fresh jab at his Russian counterpart as Washington weighs new sanctions against Moscow over the Ukraine war.

Trump's latest broadside showed his frustration with stalled ceasefire talks and comes two days after he called the Kremlin leader "absolutely CRAZY" following a major drone attack on Ukraine.

Moscow, which invaded Ukraine in February 2022, insisted it was responding to escalating Ukrainian strikes on its own civilians and accused Kyiv of trying to "disrupt" peace efforts.