The economic superpowers are vying to construct megaprojects across the continent. Countries like Indonesia have much to gain.
Japanese opposition lawmakers tried physically to obstruct the legislation in the upper house, triggering chaotic scenes. Japan's postwar constitution severely limits the deployment of its military.
In Hiroshima, the mayor called for a nuclear-free world as Japanese leader Abe and US Ambassador Kennedy looked on. The bomb killed 70,000 people instantly.
Japan is worried that China is building 16 oil rigs in order to exploit oil reserves in the Japanese part of the sea.
Japanese forces are currently bound by a postwar Constitution that prevents them playing a combat role outside Japan. Pacifist groups and numerous legal scholars have challenged the legislation.