(EnergyAsia, June 24 2013, Monday) — The biggest oil producers in Russia and China have signed what could be the world’s largest long-term contract with Rosneft agreeing to supply 300,000 b/d of crude to China National Petroleum Corporation (CNPC) for 25 years starting 2015. Rosneft President and Chairman Igor Sechin and CNPC Chairman Zhou Jiping…