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's state security service on Saturday said it was not investigating the bugging of a phone call between U.S. diplomats in which they weighed up which opposition leaders they should back for government in a reformed聽.

U.S. diplomats tried to limit the damage on Friday after audio of the phone conversation was posted on the Internet. In it, Assistant Secretary of State聽聽was heard using an expletive in reference to the聽.

German Chancellor聽, already furious with Washington over reports that U.S. officials bugged her own phone, found Nuland's remarks "totally unacceptable", her spokeswoman said.

"罢丑别听聽is not conducting any investigation into the matter at this time,"聽, a senior investigations official in the Ukrainian State Security Service, told a news conference in聽.

Nuland has been Washington's point person on聽聽since a crisis broke in the former Soviet republic last November, bringing thousands of protesters out onto the streets of聽.

The bugged phone call between Nuland and the U.S. ambassador to聽,听, was released as Nuland visited聽聽to put U.S. ideas for ending the crisis to President Viktor Yanukovich.

U.S. officials have accused聽聽of being behind a 'dirty tricks' operation.

Nuland on Friday laughed off the incident saying the bugging operation was "pretty impressive tradecraft".

She said she did not think it would rebound on relations with opposition leaders, with whom Western governments are trying to work as part of efforts to end聽's crisis.聽