Comment by WJW

Sanctioning people is basically risk-free and more importantly dollar-free. Fighting wars is extremely not-free, as Trump is currently discovering in Iran. I personally rate the risk of the US actually invading Greenland as not higher than about 10%, with the matter most likely being resolved by the US administration re-discovering that the US is allowed to establish a base on the country, doing so and then announcing with big fanfare that they solved the terrible terrible problem of Greenland being "the most unsafe".

Still though, that is about 10 percentage points higher than before Trump took office. Better not to hand him too many tools to exert leverage with.