Wow, you have such a lack of understanding of European (dare I say, global) politics that I don't even know where to start...
First off, the world is not the United States. Our countries weren't recently formed by homogeneous colonialists divvying up their spoils of war for easier administration.
Previous attempts to force the rest of the world to work like this have given us the lovely situation we now have in the Middle-East & across Africa.
European countries are built upon many different cultures, traditions & "tribes" that have interdependently developed over millennia. A single European government would work about as well as a single American government (consisting of Northern, Central & Southern America). In fact with the relatively young age of the "New World" countries, an "American" government could arguably be easier to set up!
There are very few countries that meet all the following criteria: EU member; uses the Euro; member of the NATO. Notably missing from the 'full' integration...
Those 3 institutions have very little to do with each other & the only crossover is that the EU & Eurozone happen to be based in the same region, & NATO & the EU were a result of WWII. A federation such as the United States has never been a goal.
No wonder Russia feels comfortable doing what it wants on the perifery, and will continue to shift map and influence boundaries as it wants.
Instead, the Russians fill the power vacuum like there's no tomorrow, and already granted a €10Bn loan for a Russian power plant constrution in Hungary.
If Eastern Europe falls to the Russians...
Perhaps it's a little rusty, so let me refresh your memory: It's still in recent human memory when all of that was Russian territory & the West was on the brink of war with them. Roll forward 2 or 3 decades & many of those territories are now under the wing of a political union that was their sworn enemy for a good part of a century (their support during the war was a mutually reluctant "Enemy of my Enemy" situation.
That the Russians might get a bit nervous with a Western European bloc on their doorstep is hardly a surprise.
...it's a pain that something offsets the demographic process that was going to cause an Islamic and Asian majority in the largest UK cities in a few decades.
It pains me that it's only after I've bothered writing this long reply that I see you're getting your world info from Fox. What a wasted few minutes
I think it's also worth pointing out that the most deadly attack recently experienced in Europe was committed by an extremist far-right Christian xenophobe.