The US president has insisted he still maintains a good relationship with his Russian counterpart

US President Donald Trump has said he "wasn't happy" with Russian counterpart Vladimir Putin's recent remarks questioning the credibility of the Ukrainian leadership. Vladimir Zelensky's term as Ukrainian president expired in May 2024, although he has since refused to hold a new election, citing martial law.

Russia regards Zelensky as "illegitimate," insisting that legal power in Ukraine now lies with the parliament. Last week, Putin proposed placing Ukraine under a temporary UN-led administration to organize new elections, arguing this would restore constitutional legitimacy in the country.

The Russian president warned that any peace deal in the Ukraine conflict with the current authorities in Kiev could be meaningless, as "other leaders might come tomorrow."

Speaking to reporters aboard Air Force One on Sunday, Trump said he was "very angry" and "pissed off" by Putin's statements. The US leader also threatened to impose new sanctions on Moscow if he decides that Russia is to blame for any failure in ceasefire talks on the Ukraine conflict.

Trump added, however, that he does not think his relationship with Putin has fallen to a low point.

"I've known him for a long time. We've always gotten along well, despite the Russia, Russia, Russia hoax. It's a hoax created by [failed US presidential candidate Hillary] Clinton and [Congressman Adam] Schiff and all of these lunatics. And that really was a dangerous point," Trump stated.

He added that he was "disappointed" over Putin's view that Zelensky is "not credible," but that he still expects the Russian side to cooperate on peace talks.

"He's supposed to be making a deal with him, whether you like him or you don't like him. So I wasn't happy with that," Trump said.

READ MORE: Trump threatens Zelensky with 'big problems'

The US president also accused Zelensky of being unreliable, citing his alleged attempt to back out of a rare-earth minerals agreement with Washington. He warned that any move to renegotiate the deal would lead to "big, big problems."

Trump's recent comments come despite the US leader labeling Zelensky a "dictator without elections" in February, although he later appeared to walk back on the statement.

Washington recently brokered a 30-day partial ceasefire between Moscow and Kiev, under which the two sides agreed to halt attacks on energy infrastructure. Although Zelensky has publicly backed the agreement, the Russian Defense Ministry has reported multiple violations by Ukrainian forces, claiming they are intended to undermine Trump's mediation efforts. Despite this, the Kremlin has said it will honor the deal as a gesture of goodwill toward the US.