Russia launched its largest drone attack on Ukraine since the beginning of its invasion, Ukrainian officials said Wednesday, just hours after US President Donald Trump pledged more military support for Kyiv and accused his Russian counterpart Vladimir Putin of throwing “bullsh*t” over peace talks.

Trump is openly voicing his frustration with Putin as Russia intensifies attacks while the U.S. tries to broker peace.

President Trump lashed out at the Russian leader on Tuesday, signaling a change in his posture toward the conflict.