Ukrainian President Volodymyr Zelensky needs to return to the negotiating table and strike a deal on US access to Ukraine's critical minerals.

Axar.az reports that citing BBC, this was stated by White House national security adviser Mike Waltz.

Waltz said the White House was "very frustrated" with Zelensky after he levelled "unacceptable" insults at US President Donald Trump earlier this week.

Earlier on Thursday, Waltz suggested US access to rare minerals in Ukraine could be exchanged in return for aid - or even as compensation for the support the US has already provided.

"We presented the Ukrainians really an incredible, and a historic opportunity," the adviser said, adding that it would be "sustainable" and "the best" security guarantee Ukraine could hope for.

But Zelensky had refused the offer, saying: "I can't sell our state."