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.

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.

President 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.