You said "most". That is untrue. The non-NATO W. European countries (Sweden, Finland, Switzerland) use mostly NATO-compatible ordnance. Yet again, you display your ignorance. The exceptions are, as I said, the ex-WP countries, & also Albania, & the former Yugoslavia (in part).
You haven't talked at any point about a united Europe before this. You've talked solely in terms of the manpower & weapons holdings of W. European NATO countries, disregarding all the E. European countries. Interesting how you suddenly change your tune now. In the light of this new attitude of yours, we should go back & add the large but decrepit arsenals of Ukraine & Belarus to the European totals. That's another 5500 tanks & 550 combat aircraft, not counting those in store. Now, let's add Turkey, which you have ignored up to this point. Whoops! 4200 more tanks & 445 combat aircraft. Not looking good for you, is it?
We've just added almost 10000 tanks & 1000 combat aircraft to the European total.