Donald Trump warned that if Vladimir Putin tried to conquer the entire Ukraine, it would lead to the “fall” of Russia, while also criticizing Volodymyr Zelenskyy in Sunday night’s post on socializing in truth.

"I've always had a good relationship with Vladimir Putin of Russia, but something happened to him. He was absolutely crazy!" Trump wrote in a social media post: "He killed a lot of people unnecessarily, and I'm not only talking about soldiers."

Earlier on Sunday, the U.S. president told reporters that his Russian counterparts were "very surprised" at bombings in Ukrainian cities despite efforts to promote a ceasefire.

Trump said under pressure from a reporter whether he is seriously considering "more sanctions on Russia" now, and he replied: "Absolutely. He killed a lot of people. What's wrong with him?"

Trump also criticized Zelenskyy in his post Sunday night, saying the Ukrainian president “too helpless to his country by talking about him.”

"Everything in his mouth will cause problems, I don't like it, it's better to stop."

Earlier Sunday, Zelenskyy condemned "U.S. silence" after Russia's biggest air strike in the Three Years' War, killing at least 12 people in a row, including three children from Saturday to Sunday.

Ukrainian officials confirmed that Moscow has launched 298 drones and 69 missiles in multiple waves across the country.

"Every time such a terrorist strike is enough to achieve new sanctions on Russia," the Ukrainian president said.

During his campaign as president, Trump repeatedly claimed that if elected, he would end the war in Ukraine within 24 hours, even before taking office.

But the intensity and frequency of the strikes this weekend are contrasting sharply with Trump’s claims, with Vladimir Putin interested in peace.

The attack means Kyiv Day is celebrated on the last Sunday of May - starting with exhausted people living in bunkers, subway stations and basements.

Ukraine and its European allies are trying to push Moscow to sign a 30-day ceasefire as the first step toward the end of the war. To combat their efforts, Trump refused to impose further sanctions on Moscow this week because he did not agree to stop the fight immediately as Kiev wanted.

"No pressure, nothing will change, Russia and its allies will only build power for such murders in Western countries. As long as Moscow can produce weapons, Moscow will fight."