Letting Europeans deal with Europe was the stance for all of American history until WWII.
Nonetheless, a lot of the anti-interventionist rhetoric seen on the net today feels very astroturfed. Anybody accusing NATO of warmongering is safe to write off as a Russian-aligned troll, considering Russia is the one who actually invaded a foreign country. NATO's "war mongering" amounts to offering sanctuary to the countries with a rational fear of being invaded by Russia.
The realism school of Mearsheimer is forbidden. Freedom of thought is one of the first casualties of the war.
The other side annexes territories of a neighbouring souvereign nation and bombs the infrastructure to rubble with the goal of making the freezing population surrender.
Russia, like many former colonial empires, hangs onto its dreams of Greatness and Restoration. It is up to Russia to find a new befitting place and way for its nation in the international community and history. Many other former empires were forced to do the same.