Russia pounded Kyiv with missiles and drones overnight, killing at least 12 people in the biggest attack on the Ukrainian capital this year and drawing a rare rebuke from U.S. President Donald Trump,

President Trump, who just hours earlier had suggested that Ukraine’s president was the central impediment to peace, issued a rare public rebuke of Vladimir Putin: “Vladimir, STOP!” Trump wrote on his social media platform. “I am not happy with the Russian strikes on KYIV. Not necessary, and very bad timing.”

Imposing a deadline on a negotiation for a deal you desperately want is a risky tactic if your only move is to walk away from a deal you desperately want.