Shortly before Thanksgiving, Treasury Secretary Janet Yellen met with senior officials in the White House Situation Room to discuss a Russian troop buildup on the border of Ukraine. The meeting included top intelligence advisers, defense officials and diplomats, who concluded Russia might be preparing to invade.
Ms. Yellen said she would contact counterparts in Europe and elsewhere to urge them to begin preparations for an economic response, according to people familiar with the meeting, and she started making calls to coordinate after the holiday.
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