Serbia didn’t choose to be a belligerent with NATO, but they were attacked anyway.
No only that, they had a province of their country severed off and given to someone else.
NATO is an aggressive and tyrannical force that should have been disbanded in 1991.
If we corrrectly shorten your statement to “Serbia didn’t choose to be a belligerent”, the statement is false.
The dictator of Serbia, Slobodan Milosevic decided to use force to carve what he wanted out of the former Yogoslavia, involving Serbia, usually as the agressor, with other former provinces of Yugoslavia. Those wars went on for 6 years from 1991 to 1997. NATO was called in by western Europe when Serbia attempted to try to reverse centuries of demograohic changes in what became KOSOVO. Milosovec was attempting what amounted to ethnic cleansing in a attempt to reverse those changes.