Chinese planes and ships held war games in the Sea of Japan last week, the military said, during which Beijing displayed its latest-generation frigate at a time of bitter territorial disputes with Asian neighbors. … The statement made no mention of what sort of conflict the exercise was intended as a response to, prospective foes or why the Sea of Japan was chosen as the location of the drills. However, China has grown increasingly assertive over its claim to a chain of uninhabited islands controlled by Japan …. * * * China [also] is involved in an intense rivalry with the U.S. over military dominance in the region. Tensions in the South China Sea have also risen after China refused to accept an international arbitration panel’s ruling invalidating its claim [there] …. China plans joint naval exercises with Russia in the South China Sea next month ….