Paris, France - Secretary of State Marco Rubio on Friday accused Ukrainian President Volodymyr Zelensky of lying over US demands and voiced openness to diverting weapons to Kyiv to support the US attack on Iran.

Zelensky had said in an interview that the US was pressing Ukraine to give up the eastern Donbas region to Russia, which invaded four years ago, before finalizing any post-war security guarantees to Kyiv.

"That's a lie," Rubio told reporters when asked about Zelensky's remarks.

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"I saw him say that, and it's unfortunate he would say that, because he knows that's not true," Rubio said in Paris after talks of the Group of Seven industrialized democracies.

"What he was told is the obvious: security guarantees are not going to kick in until there's an end to a war, because otherwise you're getting yourself involved in the war," Rubio said.

"That was not attached to, unless he gives up territory," Rubio said.

"I don't know why he says these things. It's not true," Rubio said.

The attack on Zelensky was especially striking coming from Rubio, a former hawkish senator who has largely been seen as more supportive of the Ukrainian cause than some others in President Donald Trump's circles.

In a scene that went viral in February last year, Rubio sat sullenly in the Oval Office as Trump and Vice President JD Vance berated Zelensky, saying he was ungrateful for US assistance.

Recently, Trump has again criticized Zelensky, saying that he needs to accept compromises and comparing him unfavorably with Russian President Vladimir Putin.

Rubio said that the US was open to shifting assistance to Ukraine after the US and Israel attacked Iran.

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"Nothing yet has been diverted, but it could," Rubio said.

"If we need something for America and it's American, we're going to keep it for America first."

But he said there had not yet been any change to the so-called Prioritized Ukraine Requirements List, a NATO initiative established after Trump's return, in which European allies fund weapons requested by Ukraine that are purchased from the US.