"Japan's" marks possession for things that belong to Japan, like its cities or culture. It can also be a contraction for "Japan is" or "Japan has," depending on context.
Self-deception ultimately explains Japan's plight. The Japanese have never accepted that change is in their interest - and not merely a response to U.S. criticism. Paul Samuelson
Let the League of Nations say whatever it pleases, let America offer whatever interference, let China decry Japan's action at the top of her voice, but Japan must adhere to her course unswervingly. Sadao Araki
It is Japan's mission to be supreme in Asia, the South Seas and eventually the four corners of the world. Sadao Araki
Follow the road behind the Emperor. We must build the world for Japan's sake, heaven ordered Japan to achieve this great mission. Kingoro Hashimoto
Despite Japan's desires and efforts, unfortunate differences in the ways that Japan, England, the United States, and China understood circumstances, together with misunderstandings of attitudes, made it impossible for the parties to agree. Hideki Tōjō
From another point of view, a new situation now seems to be arising in which Japan's prosperity is going to be incorporated into the expanding potential power of both production and consumption in Asia at large. Kenzaburō Ōe