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The UN secretary-general warned that the once unimaginable possibility of a nuclear conflict could become a reality as Russia prepares to arm itself with nuclear weapons.
US President Biden is considering a direct visit to Europe to discuss the Ukraine crisis.
Correspondent Yunsu Kim from Washington.
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UN Secretary-General Guterres has accused the Russian military of indiscriminately attacking Ukrainian civilians as they expand the war zone.
In the aftermath of this, more than 2.8 million refugees have been detained in other countries to escape Russian attacks in the past two weeks, he said.
Nevertheless, there were concerns that the possibility of a nuclear conflict increased as Russia strengthened its nuclear weapons alert rather than stopping its attacks.
[António Guterres/Secretary-General of the United Nations: The once unthinkable possibility of a nuclear conflict is now back into the realm of possibility.]
As Russia's isolation deepens, concerns over China's support are growing, Sullivan's White House A national security adviser held a meeting with Yang Jiechi, a member of the Politburo of the Communist Party of China.
The U.S. State Department warned at the meeting that China's support for Russia would affect U.S.-China relations as well as relations between the United States and its allies.
[Ned Price/State Department Spokesperson: We are closely monitoring whether China provides any form of assistance to Russia, whether financial or material.]
As the Ukraine crisis enters its third week and shows signs of prolongation, US President Biden is said to be considering a direct visit to Europe to discuss a solution to the situation with European leaders.