Nato is something like 90 percent America.
You are kind of talking up something that has no support......You can argue about the effectiveness of individual systems but Russia would just overwhelm you with scale.....As Ukraine/Nato has already found out.
I think you overestimate Russia's economic power and military power. Their industrial production is poor, they are buying back from abroad. Ukraine decimated their main force using old kit with a hand behind their back. Where are the wonder tank T90 Armada's? Where's the Felon (all four of them).
The USA could beat Russia in conventional war in a fortnight, the EU could definitely beat Russia out of Ukraine.
USA has volume but not all the best kit alone. Plenty of power in the EU military.
F35, Typhoon, Gripon, Rafael with Aim120D, Meteor are going to force the Russians way back. Brimstone, Stormshadow, Maverick Paveway and an array of other weapons, Apache E, would achieve dominance in the sky and battlefield, EU armour is not American, MLRS systems, starstreak, the variety of Sam and arty systems are not American.
It's a bill, and if we can't afford it then why make the stuff? Just beg Russia and hope for the best.
I'm not advocating it, just disagree that we'd get beat easily by this paper bear.