Germany's Angela Merkel has said a US official's apparent insult of the EU's efforts to mediate in the Ukraine crisis is "totally unacceptable."
Victoria Nuland has apologised after a voice resembling hers used a graphic swear word in a conversation said to be with the US ambassador to Ukraine.
A recording of the apparently bugged conversation was posted online, with the US hinting at Russia’s involvement.
The EU and US are involved in talks to end months of unrest in Ukraine.
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