US President Donald Trump said he is “not happy” after Russia launched its deadliest wave of attacks on Kyiv in nine months, telling President Vladimir Putin to “STOP!” as he attempts to push Ukraine to agree on a contentious ceasefire proposal.

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,

Vladimir, STOP!” the U.S. president wrote in a social-media post addressing the Russian leader, after the largest attack on Ukraine’s capital this year.