Yuri Shafranik, a former Russian energy minister, also said the private company had frozen its two onshore oil and gas projects in the country, Reuters said.
The assets are 11 oil and gas fields, including a 70% stake in the Breagh Field which produces 3% of Britain's annual gas output, Reuters said.
Russia is seeking ways to replenish state coffers hit by an economic downturn, due to the plummeting price of oil, its main export, as well as international sanctions over Moscow's role in the Ukrainian conflict.
Twafik Alskir, a senior official with Tripoli-allied naval forces said 11 Russian crew had been detained. Alskir said the tanker and crew had been taken to Tripoli port, Reuters said.
Initially broadly endorsed by Russia's anti-monopoly body, the bid has been postponed several times.
The option is part of an agreement on cooperation within the proposed joint development of the two oil fields that was signed in Beijing, Rosneft said in a statement.
China’s COSL will use the Nanhai-9 rig to drill two exploration oil wells in water depths less than 150m in the Sea of Okhotsk in 2016, Reuters said.
Rosneft is in talks with the United Arab Emirates’ Mubadala Petroleum to jointly develop two east Siberian projects, Tass Yuriakh and Verkhnechonskoye, according to the Kremlin, Reuters reported.
The transaction involves the sale of all shares of Trican Well Service LLC, an indirect wholly-owned subsidiary of Trican that holds the Russian pressure pumping business, to Trican for a purchase price of $150 million, a news release said.
Rosneft said that 10 oil basins and blocks, located onshore and offshore Brazil, would be put up for sale at the licensing round, Reuters reported.