One option would be to assume that China is gradually going to displace the US as the dominant power in the Asia-Pacific region and, therefore, to try to cultivate a much warmer relationship with the government in Beijing. The alternative would be to hug the US even closer and to cultivate warmer relations with other democratic nations in the region, such as India and Australia, in what would be an undeclared policy of "soft containment" of Chinese power.
For the moment, it makes sense for Japan to aim for good relations with both the US and China. In the long run, Japan is likely to face an uncomfortable choice.
http://www.ft.com/cms/s/0/74e9b3cc-2b1a-11df-93d8-00144feabdc0.html