Russia allowed grain carriers to leave the Sea of Azov. Bloomberg. Russian authorities have allowed grain ships to leave the Sea of Azov for the first time since July, raising hopes of reopening a vital export route for the world's biggest wheat supplier. According to three sources, the Sea of Azov port administration issued a temporary permit for ships to leave the ports of Tameryuk and the Caucasus. According to them, at least one ship has already passed through the Kerch Strait to the Black Sea. Wheat futures on the Chicago Mercantile Exchange fell 2.8% today. The window for passage in the Sea of Azov opened on Monday, sources said. Those who are ready to sail and have a full crew can request permission to go to sea, they said.