Ukraine

I think you may be underestimating the importance of UKR. The vast…vast wealth of resources in Ukraine are estimated to be in the trillions. If russia controls UKR, they will use them to strangle the world economy. Ukraine is very important to the strategic wellbeing of Europe and the US.
No, I don't think I am, especially not with respect to Taiwan's relative importance to US security. In addition, if Russia does control Ukrainian resources one day, they're certainly not going to "use them to strangle the world economy". They are and will continue to be absolutely desperate for foreign capital...to fund rearmament for another push into eastern Europe in 5-10 years, if nothing else.

Keep in mind, I'm not advocating letting Ukraine go it alone in the slightest. I agree that entry of North Korean troops should elicit a move to take the gloves off of Ukraine to strike anywhere in Russia with everything they have at their disposal. I'm simply of the mind that such an entry should not trigger the active involvement of NATO ground troops (or certainly not American men and women) into the front lines of Ukraine.