Putin is one smart cookie.
I know how easy it is to be labeled a Putin sympathizer here on FR if you don’t knee jerk condemn every move Putin makes, but he’s got his country in a better place than the democrats have us. Especially biden/obama.
We'll see. Euro leaders can now argue it is Putin who made the energy situation / prices even more dire. Up to this point the EU had only slapped Pooty's wrists (by Russia's own arguments / claims, some of which are valid, such as the near irrelevance of price caps), the EU was not really blocking energy passing through 3rd parties, filling of reserves was ahead of schedule, and so on. Sure, one can engage in interminable arguments about why Putin invaded, and claim prior blame and root causes, but "Putin shut off the gas" is simple and remains his final, compelling non-military move in terms of effect on Europe (unless he turns it back on). That will stick in people's minds and EU pols will make sure it does.
Keep in mind that those pols have an advantage: To most Euros, esp. those under 60 or so, Putin's invasion of Ukraine is (or at least was) literally unthinkable, about this || far from Pooty nuking several major Euro cities for no reason. Even the Ukies who were increasingly tussling with Russia for (actually) a couple decades, with a backdrop of centuries of historical Russian horrors, and then saw a huge buildup of a pretty obvious invasion force, didn't believe a large invasion would happen.
Further, most of those Euros supported the push away from coal and nuclear power and were fine with dependency on Russia as a gas supplier. A finger pointed at Putin is easier to accept than owning up to their own stupidity.
So... In what is really just the upcoming 2nd inning of this game, even if Europe has a colder than avg. winter (the long range forecast is for a warmish winter), my guess is that the EU pols have fertile ground to turn their energy crisis to their advantage politically. ("Never fail to take advantage of a crisis.") If that holds through the spring, and Ukraine doesn't fall by then (likely), EU and NATO unity will mostly hold: IMO, Pooty will be at a serious disadvantage. All will be damaged, but his opponents will still have at least 30x the wealth to work from.