>>248
I'm going to assume you meant their populations rather than respective geographies.

Chinese industry is heavily impeded by recurring earthquakes along the north-eastern coast, forcing manufacturers to relocate further south. Given such a small area and disadvantageous location, however, it is reticent to maintain commercial operations and shifts swiftly to military fortification. Political and racial turmoil between Japanese and North Koreans causes heavy militarisation of the former southern Chinese border. Much of Europe comes to Japan's aid in attempting to pacify the embittered, enraged North. Russia remains outwardly indifferent while secretly entertaining the notion of Chinese/North Korean alliance, given promises of an increased nuclear arsenal, technological competence, and its strategic location above the entirety of Eurasia. North Korea, in a bid for land, resources and substantial manpower, abolishes the DMZ and easily convinces the South to become part of the DPRK. Parts of the northernmost Southern Pacific are conquered jointly by China and Korea to establish a stronger commercial industry and some weapons production.

It's all fucked up.

>>250
What's it like in the universe where we've dangerously intruded upon a massive underground civilisation spanning half of Mars?