

Except in the first US gulf war, back in the early 90s. (Kuwait was attacked by Iraq. The USA spent months preparing and then three days attacking. Then stopped when Iraq surrendered.)
Or the fall of the USSR. (Happened in about a month, no major fighting.)
Or the Russian annexation of Crimea.
It isn’t that short military exercises never yield results. It’s that wars persist until both attacker and defender believe peace is the best tactic.
The USA bombing a country for whom fighting the USA is essentially their national myth is possibly the dumbest thing that my country has ever done.

One of the virtues of the EU is that it counteracts the balkanization that let people make ignorant statements like “[ part of] Europe is better than [the average part of] America”
If you separate America and Europe into similar-scale subdivisions (local schools, postal codes, sports teams, etc) you’ll find the two areas are broadly scattered on most metrics which aren’t things like “native English speakers”, “uses metric”, or “has a passport.”
“Europe” has a bunch of countries that do some things better than the typical American experience, but there are a lot of things that the USA and it’s internal states do better than the typical European experience.
(For the easiest example, look at trans rights. Some parts of the USA are Iowa and some parts are fiercely transclusive; some parts of Europe are as LGBT friendly as NY and some are TERF island. )