"The unidentified Russian, wearing sunglasses and surrounded by bodyguards, approached the U.S. delegation and asked to buy the bomber, the Komsomolskaya Pravda newspaper said.

An astounded member of the U.S. delegation said the bomber was not for sale but that it would cost at least $500 million if it were to be sold on the spot.

"That is no problem. It is such a cool machine," the Russian was quoted as saying by the newspaper, which said its reporter overheard the conversation. The bomber was not sold."