Russia overcame the United States in four sets in the women's world volleyball championship in Tokyo on Saturday. With the fresh victory, Russia maintained their unbeaten run in the event. The defending champions won the first set with considerable margins. But they confronted strong attack from the Americans in the second set and lost it 13-25. The Russians bounced back in the third set and were able to carry the momentum into the fourth one to finish the game 25-19, 25-21. The two powerhouses are competing for the top four positions in the championship with Brazil and hosts Japan. 