I have to disagree with Maozedong, geopolitically or not,
alliance can never happen between 2 part that are more or less equal, unless they face a even bigger enemy, but alliance can easily happen between a more powerful part and a much less powerful one, security and cultural, economical bond dictate everything.
Japanese alliance with US today is based out of fear and WW2 defeat, first it's not by thier(japanese) choice(and I can hardly call that a alliance, more like occupation), then it's cause of threat from Soviet, and now cause Japanese fear China's rise.
ATM. however, since both japan and china are more or less equal to eachother in terms of national strength, a alliance is impossible, but china does have the potential to FAR surpass japan in terms of everything, so 40-50years from now, who knows.
You are wrong, since the breakup of the Soviet Union, the US-Japan military alliance and not relax, but more closely, especially from the late 1990s, the military alliance on China's surrounded by more obvious, and the United States and Japan also signed a new military alliance treaty , The treaty clearly stated defense of the Taiwan Strait.
That is, from then, relations between China and Japan - in a straight unfriendly circumstances, the two countries dispute very often,the peoples of the two countries have mutual hostility, although this year, relations between the two countries had improved, but the two sides have been unable to resolve the conflict of interest .
Japan is a lack of resources of the island, from the time of China's Ming dynasty, Japan began an attempt to invade Korea and China, and finally in the time of late Qing Dynasty, Japan defeated China, occupied by Korea, Taiwan and the Ryukyu Islands, China's Lushun, and forced the Qing government to the military compensation Japan's 200 million taels of silver, Japan with the money to develop education, training personnel, Since then, Japan has become powerful.
Now, people can see that the U.S. support, Japan is the revival of militarism, Japan's navy, but also powerful than China, East China Sea between China and Japan to the interests of differences, which has the sea on a military surveillance,although the two sides No formal military conflict, but the two sides of the hostility is evident.
That is China and Japan's geo-political rule.
China and Japan how to become a military alliance ?This idea is very ridiculous.