As far as I know there are no cartels in Greenland. Trump would have to send in the military to take out the cartels in Mexico and probably at least half of the Mexican gov.
First, choke off the demand. Flood TikTok. etc. with short videos on gruesome effects of fentanyl, for instance. Might not be easy, but “just say no to drugs” is taking the first bite out of a large elephant.
As far as I know there are no cartels in Greenland.
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As long as one overlooks the Chinese mining consortium, aka military base.