NOVANEWS
The security situation has markedly deteriorated on the Korean Peninsula in recent days following the North’s latest missile test, which Pyongyang antagonistically said was a drill for striking US bases in Japan in response to the latest US-South Korean military exercises that it rightly views as a sign of hostility.

All of the actors in Northeast Asia have significant stakes in the outcome of the Korean Crisis, not least of which is that they’d all like to avoid the worst-case scenario of a nuclear war. Here’s a brief look at the interests and agendas that the exclusively Asian countries are pursing, followed later by an examination of the US and Russia’s:
North Korea:
Just like the North, the South also wants to reunify the peninsula, albeit under capitalist leadership, and its latest moves are responses to what it perceives as (and is led by the US to believe is) the “North Korean” threat, ignorantly unaware of how its own actions play into and actually started this whole escalation cycle in the first place. In regional terms, South Korea endeavors to remain the pivotal economy wedged between its larger Chinese and Japanese neighbors, ideally retaining respectable and positive relations with each, but the country is inadvertently endangering its pragmatic and profitable high-level ties with China because of THAAD and strategically converging with Japan despite Seoul’s historical-territorial disputes with Tokyo (as per the US’ envisioned Northeast Asian NATO plans).
Japan:

While none of the exclusively Asian participants in the Korean Crisis want a hot war to break out, the US doesn’t necessarily have the same reservations despite having at least 80,000 troops stationed in total in Japan and South Korea, to say nothing of their many dependents (family, contract workers, etc.). The author isn’t suggesting that the US’ one and only goal is to spark a regional war, but just that it comparatively has the least to lose out of any of the countries involved (whether directly or indirectly), and that its military forces are more than capable of obliterating North Korea, although likely with substantial American casualties depending on how long and effectively Pyongyang holds out (which could include a suicidal last-ditch nuclear strike).
Russian Recourse to Prevent Divide And Rule