The commission, reporting to Prime Minister Vladimir Putin, has also received a request from another Russian businessman, Gennady Timchenko, to increase his stake in the country’s largest independent gas producer, ­Novatek, to 23.5% from 18.2%, the head of Russia’s antimonopoly agency, Igor Artemyev, was ­quoted as saying.

An offshore-registered company controlled by Kolbin is ­expected to pay $78.5 million for the stake in South Tambeyskoye, where gas reserves are estimated at more than 1.3