Trump, on the other hand, was reportedly satisfied with the conversation with Ukrainian President Volodymyr Zelensky the next day.

Responding to reporters' questions aboard Air Force One, Trump said that during a phone call on Thursday, he had warned Putin that the United States could tighten sanctions against Russia.

The White House host added that the Russian dictator is concerned about this possibility and that he understands that new sanctions could indeed be announced.

At the same time, Trump admitted that Putin's only desire is to"keep killing people."

At the same time, commenting on the conversation with Zelensky, the US president said that it was"good" and that various issues were discussed.

"I think it was a very good conversation, a very strategic conversation," Trump claimed.

When asked about US arms supplies to Ukraine, he replied:"We helped them and will continue to help them."

"The situation is quite complicated. Let's see what happens next," the White House host added at the same time, without providing further explanations.