Russia

The Union of Soviet Socialist Republics(USSR) probably still existed in the 21st century, prior to Great War, in the Fallout world, as Natalia, one of the  Fallout 1 pre-made characters, is a grandchild of a Russian diplomat who worked at the Soviet Consulate in Los Angeles. It is, however, most likely that it it lost its position of the dominant communist country to China, as it is not mentioned at all in other parts of the background, especially in background concerning the Great War. It is also probable that USSR survived nuclear holocaust, by not taking part in Great War