President-elect Donald Trump declined to rule out using military or economic coercion as he detailed plans to seek greater US influence over Greenland, Canada, and the Panama Canal during a press conference Tuesday.
That doesn't mean that they're not Danish territory, and Denmark is a member state, and the defence clause gets activated when the territory of a member state is under attack.
Differently put: The only reason that Argentinia didn't find itself at war with the whole of the EU was because the defence clause wasn't yet law during the Falklands war. NATO's clause only applies on the northern hemisphere if I'm recalling it right, there's definitely a geographical limit.
If Austria wants to fish in Danish waters, they can do so, freely. If Denmark wants to fell Austrian trees or mine Austrian mountains, they can't.
Then, aside from that, the quotas are insane: We're constantly scraping the bottom of the barrel, barely preventing fish from dying out. Allowing stocks to recover even a bit would allow us to pull more out of the waters while simultaneously having the stocks recover even more and increase quotas again until fish again are the abundant resource they once were before literal centuries of overfishing. Would take a couple of years, maybe a handful, of reduced quotas to a complete moratorium, depending on area and species. It's a thing we can absolutely afford to do: Some reduction in consumption, some increase in imports, some money spent on mothballing ships and people's jobs for a while, gigantic payoff.