

Or Greenland could just sue them in the US, either in Texas or New York, and, at the same time, ban their supply ship from Greenland waters, and request (through Denmark) NATO assistance in order to prevent their ship or aircraft from landing in Greenland.
If any ship or aircraft ever lands, seize the contents and fine the company large sums of money for illegal drilling and operating in a sovereign country without authorization.
Locking people up for a couple of weeks before expelling them also could be considered.
Not everything has to be about guns. Whoever has been hired by this company to provide security will probably quickly understand that area outnumbered by Greenland law enforcement and Danish military.

My Spanish teacher used to say:
if you speak Spanish and French you already know 80% of Italian.
If you speak Italian, Spanish and French, you already speak Portuguese.
And I have found this to be mostly true. Native French speaker, good Spanish: I can read 80% of any Italian text I come across.
Oh, and don’t forget Romanian is also very close.