The Democratic Party of Japan (DPJ) is making more moves to become independent of japanese-american relations but America has nothing to fear. Its an interesting article because it shows Americas dependency on territorial additude.

For half a century, the United States and Japan have been pals across the
Pacific. Whenever officials from both countries meet, they almost always hail
the U.S.-Japan alliance as "the cornerstone" of America's foreign policy in Asia
and boast how it is "one of the most important bilateral relationships in the
world." But the ouster this week of the party that has governed Japan since
1955—and the arrival of a group that occasionally badmouths America's role in
the region—has frightened people that the happy days have come to an end. They
should relax.

http://www.newsweek.com/id/214810