The reason I think countries in the pacific need to worry is becuase China apparently has made a move toward the pacific islands such as Wake Island 2007. Hell, if China invaded Taiwan, it might be enough to spark a conflict between the United States and China. That in itself might be a good plot to get the war going. With that said again, I believe China wouldn't hesitate to attack key islands such as Japan, the Philipines and the hundreads of smaller islands dotted around the Pacific Ocean.
Japan's armed services are strictly meant for defence. Although I think it was a while back when Japan did have a small amount of troops in Iraq. In any case my scenario would have China attacking Japan. For the most part the U.S does have naval and marine forces stationed in Okinawa, Japan. That alone is enough to pose a threat to China.I think Japan also has a defensive force because of WW2





