Russian intelligence official Ivan Tkachev does Sechin's financial counterintelligence bidding span >
Western sanctions have boosted the K Department of the Economic Security Service, a branch of Russia's internal intelligence service, the FSB, in its efforts to rein in Russia's oligarchs. It has been headed for the past six years by General Ivan Tkachev, who is very close to Rosneft's boss Igor Sechin. [...]