Russian President Vladimir Putin and Turkish leader Recep Tayyip Erdogan discussed possible ways to release the grain stuck in Ukrainian ports in a phone call on Monday. It is time for the United Nations to implement the plan for a grain corridor through the Black Sea, according to a statement issued by the Turkish presidential office. Ukraine is a key wheat supplier for many parts of the world but the war and blockades of its ports mean most of the grain is not getting out, causing worldwide food shortages. Many Western countries blame Moscow for the grain crisis and knock-on effects on food …