Oil tankers used by the Russian Federation are ceasing to operate under the flags of Liberia and the Marshall Islands. This comes after the US has intensified sanctions on vessels associated with these registries, according to Reuters. Dozens of Russian tankers have lost the ability to operate under these flags in recent weeks. The change reflects the close relationship between the US and the flag management companies of Liberia and the Marshall Islands, whose headquarters are located not in their countries, but in Virginia (USA), within the jurisdiction of American sanctions. According to ene…