"Very disappointed": During talks, Trump keeps denouncing Putin's military strategies

President Donald Trump, who has recently referred to Russian President Vladimir Putin as "crazy" and warned that he is "playing with fire," has expressed dismay in the Russian leader's increased attacks on Ukraine during the ongoing peace talks.

"What happened a few nights ago, where people were slain during what you would call a discussion, has greatly disappointed me. That really disappoints me," Trump stated on May 28 during an event held at the Oval Office.

In the worst aerial assault of the conflict to date, Russian forces launched 367 drones and missiles at Ukrainian cities over the weekend, including the capital Kyiv. Officials reported that the onslaught killed at least 12 people and injured dozens more.

In a social media tweet on May 25, Trump reacted to the incident by saying that Putin had "gone completely insane."

In response, the Kremlin referred to Trump as emotional.

According to Kremlin spokesperson Dmitry Peskov, "this is a very significant time, which is coupled, of course, with the emotional overload of everyone absolutely and with emotional reactions," in response to Trump's comments regarding Putin.

As Russia has persisted in its attack on Ukraine, Trump warned on social media on May 27 that Putin is "playing with fire."

Trump stated, "What Vladimir Putin does not understand is that if it were not for me, Russia would have already experienced a number of incredibly horrible things—I mean incredibly horrible."

Trump spoke with Putin for more than two hours earlier this month and has attempted to persuade both sides to agree to a ceasefire in the three-year-old conflict in Ukraine.

Asked May 28 if he still believes Putin wants to end the war, Trump said "I can't tell you" but suggested the next few weeks will be revealing.

“They seem to want to do something but until the document is signed I can’t tell you, nobody can," Trump said.

There have been growing calls for the U.S. to impose stronger sanctions on Russia. Trump said he doesn't want to impose sanctions if he's close to getting a deal. Sanctions could "screw it up," he said.