WASHINGTON (AP) — President Donald Trump on Thursday offered rare criticism of Vladimir Putin, urging the Russian leader to “STOP!” after a deadly barrage of attacks on Kyiv, Ukraine’s capital.

“I am not happy with the Russian strikes on KYIV. Not necessary, and very bad timing. Vladimir, STOP! 5000 soldiers a week are dying.” Trump said in a post on his Truth Social platform. “Lets get the Peace Deal DONE!”

Russia struck Kyiv with an hourslong barrage of missiles and drones. At least 12 people were killed and 90 were injured in the deadliest assault on the city since last July.

Trump’s frustration is growing as a U.S.-led effort to get a peace agreement between Ukraine and Russia has not made progress.

The comments about Putin came after Trump lashed out at Ukrainian President Volodymyr Zelenskyy on Wednesday and accused him of prolonging the “killing field” by refusing to surrender the Russia-occupied Crimean Peninsula as part of a possible deal. Russia illegally annexed that area in 2014.