Europe has provided massive aid to Ukraine, mostly financial. Their hesitation has been committing themselves militarily to the war, which, if they did, would be a huge benefit to Ukraine. But their current level of support is still very substantial (and necessary).
Greenland isn't important because it's Greenland, it's important because taking it shatters NATO. As an attack on Denmark it's actually less important than the deathblow to an alignment that has been foundational to the world order for the last 80 years. If the US takes Greenland, the whole international order breaks down, so yes, they're taking it very seriously.
> Greenland [is] important because taking it shatters NATO.
It's even more striking to me then that the Europeans would draw the line, rather than seek some kind of Trump appeasement. Standing up to Russia in Ukraine does not affect the credibility of NATO, but standing up to Trump does.
Greenland isn't important because it's Greenland, it's important because taking it shatters NATO. As an attack on Denmark it's actually less important than the deathblow to an alignment that has been foundational to the world order for the last 80 years. If the US takes Greenland, the whole international order breaks down, so yes, they're taking it very seriously.