speaking about defending ourselves: there's a huge gap between "willing to defend" and "actually be able to defend" ourselves
Psychologically, becoming a soldier will be difficult for everyone; if Russia launches an offensive against the EU, the regular army alone will not be enough.
With what?
Russia has been wringing itself out to find enough soldiers to continue the war in Ukraine, and while they haven't been driven out just yet, I think it would be somewhere between "a massive stretch" and "flat-out untrue" to say they're winning.
And by and large, the rest of Europe is farther away, has a much worse/less clear casus belli from Russia's point of view, and, crucially, is part of NATO, and thus will not be fighting alone (and yes, I know Ukraine is getting a lot of support from Europe, but support isn't the same as boots on the ground).
If Russia launches an offensive against the EU, there's a damn good chance that offensive boomerangs right back around into its face.