Post-Ukraine Russia isn't going to have a whole lot to contribute to the far east in terms of equipment beyond the Pacific fleet. The US and South Korea would easily be able to wipe the floor with North Korea despite some initial early losses (hello 5000 mobile rocket launchers), particularly once the US 3rd and 11th fleets manage to intervene.
Once China and Russia get involved in the ground war on the peninsula though, things would get very ugly indeed. China has learned its lessons from watching the US operate during the GWOT, and has reformed their military to be more capable, particularly with combined arms operations. They still have an utterly staggering number of troops to contribute (assuming they aren't bogged down elsewhere), particularly from the north.
Japan would be reluctant to get involved based on their historically poor relations with South Korea, but would likely get dragged in eventually regardless. ANZAC would contribute some token forces. Other allies would probably send help as well depending upon what they have available to donate.
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