MOSCOW (Reuters) – The blame game over a contamination scandal in Russia’s oil industry has breached President Vladimir Putin’s inner circle. FILE PHOTO: Russian President Vladimir Putin gestures as he talks with Igor Sechin, the chief executive of Russia’s top oil producer Rosneft, during a signing ceremony following a meeting with Italian Prime Minister Paolo Gentiloni at the Bocharov Ruchei state residence in Sochi, Russia, May 17, 2017. REUTERS/Yuri Kadobnov/File Photo Igor Sechin, head of Rosneft, the world’s biggest publicly-traded oil company, and Nikolai Tokarev, the boss of Transneft, the world’s largest pipeline network, are embroiled in an unusually public and rancorous dispute over their companies’ responses to the contamination of Russia’s Druzhba (“Friendship”) pipeline, an episode that disrupted exports and tarnished Moscow’s image as a reliable energy supplier. Sechin and Tokarev have quarreled on and off for over a decade about everything from tariffs to Chinese oil deliveries. […]