The US said it will have to continue to stem Putin's actions in the strongest possible way. (File)
Washington:
President Vladimir Putin's order to put Russia's deterrence forces, which include nuclear arms - on high alert is unacceptable escalation, US Ambassador to the United Nations Linda Thomas-Greenfield said on Sunday.
"It means that President Putin is continuing to escalate this war in a manner that is totally unacceptable and we have to continue to stem his actions in the strongest possible way," Thomas-Greenfield said in interview with CBS "Face the Nation."
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