President Joe Biden's national security adviser Sunday warned that there will be repercussions for Russia if Putin critic Alexei Navalny dies amid reports that his health is rapidly deteriorating in prison.

"We have communicated to the Russian government that what happens to Mr. Navalny in their custody is their responsibility and they will be held accountable by the international community," Jake Sullivan said on CNN's "State of the Union."

He did not specify what action the U.S. and its allies might take in the event of Navalny's death.

"In terms of the specific measures that we would undertake, we are looking at a variety of different costs that we would impose," Sullivan said. "And I'm not going to telegraph that publicly at this point, but we have communicated that there will be consequences if Mr. Navalny dies."

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