Both Korean factions are gearing up for a war and they just waiting for who will make the first bad moves same scenario between the Philippines and China for the Territorial disputes on the West Philippines sea, Taiwan is also gearing up against China if China decides to invade them, The Asian region could be in a brink of wars and any one of these could start it, it will be a domino effect if that happens, North Korea will have a big impact because of their nukes, that is why the US is making its presence here to at least neutralize China's presence in this region.
It's really a silent war between the two superpowers.