U.S. warns Russia against using nuclear weapons in Ukraine

Mr. Sullivan stated on Sunday's episode of "This Week" on ABC News, "We have spoken explicitly privately to the Russians at very high levels.

That the United States would react strongly with its friends and partners has been made very clear, he added.
To quote a senior official.

We have indicated to the Russians what the implications would be, but we have been cautious in how we speak about this publicly.

On NBC's "Meet the Press" on Sunday, Mr. Sullivan said he had spoken with high-ranking Russian officials since Russian President Vladimir Putin's latest threat on Wednesday.

"That has occurred regularly throughout the course of the last months," Mr. Sullivan said on NBC.

It's happened even in the last few days, but we haven't wanted to indicate exactly what those channels look like because we want to be able to protect them .

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