The East Asian Co-Prosperity Sphere was Japan's answer to the EU. It was a military alliance and economic organization. It was formed after World War 2 to help South East Asia recover from the devastation.
Its members include:: Japan, China, Mongolia, India, Pakistan, Thailand, Burma, Philippines and Bhutan. Al the signatories of the Tokyo accords vowed to defend one another if attacked, and to work together on major projects, like the Space program.
The USA would be a major trading partner for the East Asian Co-Prosperity Sphere to the present day, with the USSR being a nominal trading partner as well.