Of course the West made a lot of mistakes in the past years, because this sh*t did not happen overnight. And, of course, NATO mutual defense would be enabled if one member is attacked… it’s WWIII, which may end in 30 minutes for all parties involved, as the endgame. That’s why them, the EU (which is a mutual, imperfect non-aggression union of democracies in the Western Europe), the UK and the US have to buy time until reasonable.
In this instance, any member have to sort them out (eg. Italy summoning its defense committee, putting out instructions for regions and cities, implementing energy cuts to non-fundamental sectors, re-enabling dismissed fossil power plants, coordinating with allies and partners for Vicenza and Sigonella / Global Hawk bases, etc.).
Does it mean Ukraine is fecked? Today, tragically, yes… tomorrow, who knows? Does it mean Putin has won the war? Again… today, tragically, yes… tomorrow, possibly not: he is still playing according to accepted, conventional warfare manual, yet it is not clear how he is going to sustain the wreckage of today and the implications for tomorrow.