Strongest military alliance on the planet.

Except the opposite has been shown to be the case now that this alliance has been put to test https://www.rusi.org/explore-our-research/publications/commentary/return-industrial-warfare/

Starting a land war in Europe is going to make Europe treat you like a threat.

Then please explain NATO invasion of Yugoslavia to us.

See Ukraine.

The same Ukraine that's been trained by NATO to "NATO standard", supplied by NATO, and all but integrated into NATO already?

Ukraine had an army that was by far the biggest and most experienced, after 8 years of civil war, in Europe. No other NATO country aside from US even comes close. This army is currently losing to a force that Russia deployed which accounts for a small part of Russia's overall military strength.

The lesson from Ukraine is pretty clearly that it's a very bad idea for NATO to continue escalating tensions with Russia.