> It's just a matter of how much international support it will have initially, and how the USA will strong arm support.

That's where i think France have dropped the ball with its last presidents. Any pre-2007 president would have already declared Greenland as "EU, thus France sovereign interest" and reiterated French nuclear doctrine since 1964 (One warning shot, then tactical nukes, aiming for the army/supply and not civilian infrastructure). Macron will never do that, because if you say it, you have to follow up.