US President Joe Biden on Saturday spoke to his Ukrainian counterpart Volodymyr Zelensky and discussed security and financial support for Ukraine, the White House said.

According to the White House, Biden, in a phone call with Zelensky, highlighted the actions undertaken by the US and its allies to “raise the costs” on Moscow for its “aggression in Ukraine” and welcomed the decision of Visa and Mastercard, the leading global payments and technology companies, to suspend their operations in Russia.

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“President Biden noted his administration is surging security, humanitarian, and economic assistance to Ukraine and is working closely with Congress to secure additional funding,” the White House said in a statement.

The US President also lauded the Ukrainians for their “skill and bravery” of the Ukrainian operation who have kept the reactors in a safe condition.

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A fire broke out in a training building of the Zaporizhzhia nuclear power plant in southeastern Ukraine as shells hit the area early on Friday, triggering alarm around the world of a possible catastrophe before the fire was extinguished.

“The world narrowly averted a nuclear catastrophe last night,” Linda Thomas-Greenfield, US Ambassador to the United Nations, told an emergency meeting of the Security Council.

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“Russia’s attack last night put Europe’s largest nuclear power plant at grave risk. It was incredibly reckless and dangerous. And it threatened the safety of civilians across Russia, Ukraine and Europe,” Thomas-Greenfield said.

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Ukraine’s nuclear regulator confirmed to the International Atomic Energy Agency (IAEA) that two out of 6 reactors are working, and the radiation levels are normal.