Joe Biden sends CIA Director Bill Burns to Moscow to warn Vladimir Putin off building up troops on Ukrainian border after energy crisis sparked fears of Russian invasion CIA Director Bill Burns made a rare trip to Russia to hold talks with their national security officials, who are directly involved in the troop buildup The United States is growing more and more concerned by the activity, multiple sources said Burns also spoke to Ukranian President Volodymyr Zelensky by phone, a senior State Department official told CNN
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