From left, Chairman and Chief Executive Officer of Japan Oil, Gas and Metals National Corporation Tetsuhiro Hosono, Japanese trading company Mitsui & Co's President and CEO Tatsuo Yasunaga and Chairman of the Management Board of Novatek Leonid Mikhelson 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.