The Russian foreign minister Sergei Lavrov has been furious Friday during a phone call with his British counterpart David Miliband, as disclosed by the British "Daily Telegraph."

The publication further talks about Lavrov objecting to being lectured by his British colleague.

One insider, who has seen the transcript, has said that it was difficult to draft a readable note of the conversation since there has been a repeated use of the "F-word."

During the conversation Lavrov allegedly said: "Who are you to f------ lecture me?" and asked Miliband in blunt terms whether he knew anything of Russia's history.

Lavrov later insisted that he had not been swearing and accused the British Foreign Office of trying to smear his reputation. He also said that he was taking the "unusual step" of declassifying and releasing the Russian transcript of the conversation.

Sources at the Foreign Office claimed there was swearing "but only from one side," and explained that this has not been a conversation where the language of diplomacy has been used, but a rather shocking talk.".

A spokesman for the Foreign Secretary said: "We do not discuss diplomatic conversations between foreign ministers."

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