Recently, Japan, India, and the United States had naval drills in the Pacific Ocean. Japan provided escort vessels. There was a U.S. destroyer, and three Indian warships.
These drills were supposed to be for boosting friendly relationships among the three countries and to improve maritime technique.
Japanese Prime Minister Shinzo Abe has repeatedly called for a four-way alliance among Japan, India, the United States and Australia. His reasoning being this is to counter frequent tension with China according to this news article. I’m not sure what kind of conflict he is referring to; I am guessing military.
In this way, Japan is seeking to ally itself with other countries in order to boost its own power relative to China. After all, China is becoming the new challenger in Asia. Also, Japan is not challenging the U.S. hegemon but seeking to benefit from its power.
source: http://news.yahoo.com/s/afp/20070416/wl_sthasia_afp/japanusindiamilitary_070416061321

