India’s largest refiner, Reliance, has stopped buying crude oil sourced from Russia and carried on tankers owned by Sovcomflot as the U.S. tightened sanction enforcement. The information comes from two unnamed sources familiar with the situation who spoke to Reuters. Sovcomflot was among a number of Russian entities that were individually targeted with U.S. sanctions last month. As a result, Reliance has asked its Russian oil trading partners to not load the shipments on Sovcomflot vessels, the Reuters sources said. The latest round…