Irony: NATO maybe was considered of questionable necessity before Putin invaded Ukraine to supposedly contain NATO, which ended up being a gigantic ad for NATO. Now it's on track to become the de-facto EU military.
Putin is yet another fabulous counterexample for the anti-democracy crowd. He spent hundreds of thousands of Russian lives, hundreds of billions, tons of military hardware, and incurred sanctions to earn... a massive increase in the strength and prestige of one of his (again supposed) major adversaries. Not only is NATO growing but the EU is ramping up its own domestic military industries. Absolutely massive own-goal. Even if he "wins" in Ukraine to some extent it's a strategic net loss at this point.
Starting to wonder if China is going to do the same thing with Taiwan: invade and set gigantic amounts of money on fire and implode their economy. Even if they "win" the damage might far exceed the gain.