“Above all, you don’t wage wars to annex territory in Europe.”
Oh, sure. That’s why we bombed Yugoslavia and Serbia, independent/sovereign countries, under the Clintonisa regime.
We didn't break it up: it fell apart due to the wishes of its own peoples, although we warned Kohl that German recognition of an independent Croatia would precipitate a war between Croatia and Serbia, which it did. So the Us was actually trying to work out a political solution. We only intervened when the Serbs resorted to rapine and mass murder to try to restore the status quo, a penchant for which they share with the Russians. Read up on the Balkan Wars in the early 20th century.