Yeah, that one of example - it has many paths to hurt the US without sanctions.
As American, I'm completely opposed to all of Trump and his supporters.
I do think that consequences would be depends on Greenland, so at minimum, EU countries wouldn't recognize US occupied of Greenland as legitimate, open the multipolar like form the strong relation with China and make businesses (even semiconductors) much easily for China - those don't need sanctions, also EU could remove all of sanctions to China. The US isn't going to like those to as way to empower China.
Denmark is likely to know that US occupied of Greenland would be reversed after democrats take control of the US president and waive all of EU countries for loosen the trades with China because it is caused by Trump.