(Reuters) -Russia will announce a number of initiatives related to gas cooperation with Turkey and grain exports at a gathering of leaders from the Group of 20 (G20) nations in Indonesia next week, the foreign ministry said on Thursday. “A number of specific initiatives are planned, including increasing gas cooperation with Turkey, (and) organising large shipments of grain and fertilisers,” it said in a statement. President Vladimir Putin, who will not be attending the summit in person, has proposed the idea of creating what he calls a “gas hub” in Turkey, via which shipments of Russian gas co…