The Investigative Committee said in a statement the detention was carried out as a result of an operation by the FSB security service, the successor to the KGB.
It claimed the minister received the money yesterday for giving the go-ahead for Rosneft to acquire a majority stake from the state in Russian oil company Bashneft in a $5.2 billion deal last month. The statement does not say who gave the bribe to Ulyukayev.
"The entire sum -- 329.69 billion rubles -- will go to the Russian budget," Ulyukayev said in a statement after the deal on October 12, adding that the government had received only two bids and the other one had been less than the company's independently assessed value.
Putin said publicly at the time that he was "a little surprised at such a position of the government, but this really is the government position, primarily of the financial and economic bloc".
Spokeswoman Svetlana Petrenko told RIA Novosti news agency: "This is about extortion of a bribe from Rosneft representatives accompanied by threats."
"Ulyukayev was caught red-handed as he received a bribe," she said.
She said that "The acquisition of the Bashneft shares was carried out on a legal basis and is not the subject of the criminal investigation."
RIA Novosti cited a law enforcement source as saying that Ulyukayev was detained as part of "sting operation" after investigators received "serious evidence" from "tapping his conversations and the conversations of his associates".
Kremlin spokesman Dmitry Peskov told Interfax news agency: "This is a very serious accusation that requires very serious proof. In any case only a court can decide."
Asked if President Vladimir Putin knew of the detention, he said: "It's night time, I don't know if the president has been informed."
First deputy central bank chief Sergei Shvetsov told RIA Novosti that Ulyukayev "was the last person you would suspect of something like this. What is written in the media looks absurd. Nothing is clear now".
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