frankly speaking, except US interest, rest all as a whole - EU / NATO rest 35 or 37 , are negligible in any assistance, be it militarily or almost non existent humanitarian assistance, and Syria and NK has difference in basic, the whole NK sits or stands in one word of Kingkong Un!! and that country is highly militarised, though not by quality or weapons or training, but by basis knowhow. They can at least assist the Donetsk and Luhansk province militia defence while russia can arrowhead at south with its army in full.
More over Europe and US has to brace itself for upcoming economic depression.. While US can somehow withstand it thanks to it's robust economic backbone, but, doubt the European countries can thrive through it..
Russia will just keep pounding your army from a stand still until as your prez said- the last Ukrainian, and the aid weapons stops coming ( they are not cheap to replenish ) are morally broken. America already shipped you it's third HIMARs missile stock, don't think they will transfer much more, specially at current china- Taiwan conflict backdrop.
WRT geo- political and economic aspect, Taiwan is way heavy to protect irt Ukrain, fear we will see this conflict can soon go cold-shouldered by west.
If Ukraine perishes, there won't be much change in world, except temporary shortfall in wheat and edible oil and some military techs.
but, if Taiwan falls, whole world economy will face an unprecedented shortfall in electronic chips. It needs decades to establish credible capability. More over it will dent the unipolar world image of US hegemony to a multipolar world, which certainly US wont take as something eye-candy.