Everyone is going to be hurt, but if you're not the US you need to hedge. Being firmly aligned with the US is too dangerous right now. Lots of negative costs and outcomes come with that hedging.
Not really sure who it's going to hurt most.
Yup. They're damned if they do and damned if they don't. They question is, place your eggs in one basket and become subservient to one country or diversify and try to play others against each other.
China is the only vertically integrated economy left. In a multipolar/bifurcated/low trade world they will be the strongest.
The NAFTA/EU trade blocks were extraordinarily strong, this Greenland business is exactly the kind of issue which can shatter the entire block. It benefits no one to give Greenland to the US, so they won’t do it without a fight. It provides no benefit to the US to take it.
The only thing that would really be settled by the US annexing another country on a presidents whim is the formal end of the U.S. separation of powers.