Ukrainian President Volodymyr Zelensky addresses British lawmakers in the House of Commons in London. AP

Ukrainian President Volodymyr Zelensky thanked the leaders of the US and Britain for banning Russian oil imports.

"This is a powerful signal to the whole world,” he said in his daily address to the nation at the close of another day of war. "Either Russia will respect international law and not wage wars, or it will have no money.”

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Zelensky said when he went to address the British Parliament, "the scariest figure was the 50 Ukrainian children killed in 13 days of war. But then in an hour it became 52 children. I will never forgive this. And I know that you will never forgive the occupiers.”

Volodymyr Zelensky addresses British lawmakers in the House of Commons in London on Tuesday. AP

Zelenskyy called for negotiations with Russia on ending the war. "The war must be stopped. We need to sit down at the negotiating table, but for honest, substantive talks.”

Meanwhile, the Pentagon said on Tuesday that Poland’s offer to give its MiG-29 fighter jets to the US so they can be passed to Ukraine raises serious concerns for the NATO alliance and the plan is not "a tenable one.”

Pentagon Press Secretary John Kirby said in a statement that the prospect of jets departing from a US/NATO base in Germany to fly into airspace contested with Russia in the Ukraine war is concerning. He said it’s not clear to the US that there is a substantive rationale for it, according to The Associated Press.