The crisis over Ukraine sees no progress as the U.S. and Russia have hit a stalemate. The U.S. and NATO have made no concessions to the main Russian demands, which include a guarantee that its western neighbor can never join the alliance. Moscow said it needs time to review Washington's response and would not rush to conclusions. The White House says it's not sure whether Russia is playing games on diplomacy. Russian Foreign Minister Sergei Lavrov said the U.S. responses gave hope of starting a serious dialogue, but only on secondary questions and not the fundamental issues.