Simple. The EU is not military united but it's pretty much a "every man for himself" kind of thing outside of NATO or a direct attack, but the EU or NATO is currently not under attack so some people see Ukraine as "more of you problem than a me problem"… so other than sending some aid to Ukraine most people don't want to go to war with Russia or suffer crippling energy shortages for Ukraine.
EU leaders are also not immune from kleptocratic greed and external and internal corruption.
Austria is more than happy to keep pumping money into Russia in exchange for cheap gas, as that gas runs 80% of their industry, and several elite Austrian politicians were given top jobs on boards of Russian oil and gas companies to lobby for them and against nuclear or other alternatives, or have straight up offered their support to Russian oligarchs in under-the-table business deals ( the infamous "Ibiza scandal").
Good luck replacing that gas on a whim after several decades of Russian lobbying that lead to the current status quo.
Deliver stuff nobody needs? LOL, the American oligarchs aren't much better. Just because they use a different word (lobbying instead of bribing) doesn't make it any less of a corrupt system.
https://abcnews.go.com/Blotter/77-billion-raptor-22-fighter-...
https://www.nbcnews.com/think/opinion/air-force-admits-f-35-...
https://www.military.com/daily-news/2014/12/18/congress-agai...
At least in the US, via lobbying, the bribes are transparent and you can follow the money and see who's pulling the strings.
This is much better than everything being done under the table and assuming there is no corruption because we don't have lobbying, like the classical misconception we have in Europe.
But the Soviet Union fell thirty years ago, an entire generation ago. The Soviet Union had 280 million people, more than the US had at the time. Big. Scary. But Russia today has only 140 million people. Over half the population just up and left when given the chance. They said "thanks, but no thanks" to Moscow.
Sure, Russia still has a big military budget, but their GDP isn't that great. Their GDP is much smaller than Italy's, alone. Smaller than France's, alone. Smaller than Germany's, alone. Hell, even the five Nordic countries have a higher combined GDP than Russia has. Growing up in the Nordics during the cold war meant having to think about Russia as an enormous big bad who could crush us completely if they wanted to. But now, our combined economies are larger.
Russia is corrupt, and has been corrupt for an entire generation. And it's been corrupt on a scale that is unprecedented compared to itself in the past, and compared to the rest of Europe. We complain about the military-industrial complex and how much waste there is, but military contractors in the west actually deliver stuff, whereas all the corrupted half-assery of the Russian military is being exposed now.
The combined defence budget of the EU is about 4 times larger than Russia's. Since the end of the cold war, the EU has been prosperous, peaceful, and happy. We've invested in our defence and grown stronger over the last thirty years, while Russia has declined.
We in the EU have over three times the population, over four times the military budget, and ten times the GDP of Russia. We have nukes and tanks and aircraft carriers and submarines and stealth fighters of our own. And yet so many still view Russia as a threat, as a bigger and stronger foe.
This debacle sure has been eye-opening to me, and I hope it's been that way for everyone else stuck in the cold-war mentality.