I seriously doubt even Trump thinks Greenland is a national security issue. He wants it because some other billionaires want it. Some for resource extraction and some who want to build a planned city to push forward their techo-feudal agenda.
The Poles have quietly been building one of the largest militaries on earth. They’re not trying to let themselves get conquered or partitioned again. I don’t think it would take much for them to go eagerly to war with a belligerent Russia. More likely Russian’s next conquest will be against small and vulnerable countries like Georgia or the Baltics if they can get NATO to crumble (or Trump goes to war against NATO over Greenland).
I think the South Korea military would triumph over the North Korean military but NK would cause substantial civilian casualties with the large amount of artillery it has along the border.
It doesn’t help the working class if a different group like the Vanguard seize them instead.
The most recent year that numbers are widely available for was 2024 when Germany had 184,000 active-duty military personnel. Poland had 216,000 active military personnel; among NATO countries only Turkey and the US had more. Poland had the 13th highest military budget on Earth and was ranked 14th for military expenditures as a percentage of GDP: 4.1% (the highest in NATO).
Their reserves ARE limited in number, but they’ve been spending their funding on large quantities of equipment and weaponry.