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April 26, 2022

It’s crucial for the U.S. to make Russia understand the consequences of an unthinkable escalation.

By Robert C. O’Brien

The most sobering briefing I received as White House national security adviser came on my third day in office, Sept. 20, 2019. I sat in the Situation Room with military officers and ran through the what-ifs and procedures for continuity of government and retaliation options in the event of a nuclear attack on the U.S. or one of our treaty allies.

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