US Concerned About Escalation From Russia but Not Changing Nuclear Posture: White House

White House national security adviser Jake Sullivan speaks to the news media about the situation in Ukraine during a daily press briefing at the White House on Feb. 11, 2022. Leah Millis/Reuters

The Biden administration is very “concerned” that Russia might escalate its invasion of Ukraine and use nuclear weapons, U.S. national security adviser Jake Sullivan said Sunday.

In an interview with CNN’s Dana Bash on “State of the Union,” Sullivan said the United States was monitoring Russia’s moves closely but noted that officials have not yet seen anything that would require them to change their “nuclear posture.”