A standard watch of the liquefied all-natural gas plant operated by Sakhalin Vitality at Prigorodnoye on the Pacific island of Sakhalin, Russia July 15, 2021. Photo taken July 15, 2021. REUTERS/Vladimir Soldatkin Sign up now for Free of charge unrestricted accessibility to Reuters.com Sign-up TOKYO, March 28 (Reuters) – Japan Petroleum Exploration Co (Japex) (1662.T) said its new prolonged-phrase small business program, unveiled on Monday, was primarily based on an assumption that it would retain its stake in the Sakhalin-1 oil and gas venture in Russia. Japan’s consortium, Sakhalin Oil and Fuel Progress (SODECO), owns a 30{3e92bdb61ecc35f2999ee2a63f1e687c788772421b16b0136989bbb6b4e89b73} stake in the Sakhalin-1 project from which Exxon Mobil (XOM.N) has explained it…