In the 1990s the close security relationship between the U.S. and Japan is being eroded by the disappearance of traditional Cold War threats and an increase in international trade disputes. In Japan, market opening demands from Washington and the fraying of America's social fabric have raised questions as to the wisdom of relying too heavily on the U.S. as a security partner and a socio-economic model. In the U.S., frustration with continuing bilateral trade deficits and a growing perception that the Japanese are playing by different economic rules has begun to strain the relationship. Particular concern has been raised about the danger of U.S. technology flow to Japan in both the military and civilian sectors. While a close U.S.-Japan security relationship is likely to continue for many years, both nations will have to learn how to participate in a more equal partnership.