From left, Chairman and Chief Executive Officer of Japan Oil, Gas and Metals National Corporation Tetsuhiro Hosono, Chairman of the Management Board of Novatek Leonid Mikhelson and Japanese trading company Mitsui & Co's President and CEO Tatsuo Yasunaga attend a signing ceremony with the participation of Japan's Prime Minister Shinzo Abe and Russia's President Vladimir Putin, following the Group of 20 (G20) leaders summit in Osaka, Japan.