The officials noted that a Russian assistant deputy prime minister was among the first to tweet about a YouTube video that contains audio of the alleged call between the top US diplomat for Europe and the U.S. ambassador to Ukraine. White House spokesman Jay Carney pointed to the tweet but declined to comment on the source of the audio.
Voices resembling those of Assistant Secretary of State Victoria Nuland and the envoy discuss Ukraine. At one point, the Nuland voice says "F--- the EU," describing her frustration over international efforts to resolve Ukraine's political crisis.
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