China And North Korea
Japan,Taiwan and South Korea
In the bounds set by the creator of this poll (meaning no allies), you have 1.5 nuclear armed nations against 3 non-nuclear nations. In conventional weapons both sides would be fairly even, but nukes put China on top.
Nukes Duh...... China could use Taiwan pre-invasion task force to attack taiwan then NK nukes SK and China Nukes Japan Yay!!!!!!!!!!!!!!!!!!!!!! :)
Japan, Taiwan and South Korea can't win if they don't have America on their side.
This is because China itself is a superpower, and with the help of North Korea, Japan, Taiwan, and South Korea do not stand a chance.
China would likely invade Japan in an effort to quickly knock it out of the war. Taiwan and Korea would likely fall, but China and N Korea would not be able to invade the island of Japan. It would retrigger Japanese radicalism and they would no doubt genocide against China and Korea using their air supremacy to weaken China and a direct naval invasion of N Korea to cripple it's lines in the South resulting in a long, brutal but more importantly a glorious victory on the behalf of the coalition
North Korean army sucks, but not Chinese, although, Japanese have improved weaponry, so does South Korea, and Taiwan is a separate colony, and they don't support China. So why not pick Japan and the others rather than Communism? Japan and South Korea are willing to protect Taiwan and besides, even Taiwan could completely destroy China.
China would definitely win but I could never vote for communists.
The US would intervene on their side.
Well, first and most thing, Japan has one of the most technologically advanced military in the world. The moment a plane takes off from China, Japan knows. South Korea has already won a war, they could do it again. The only issue here is that none of these countries actually get along.