Pardon?
If you mean Afrin, not sure Syria counts as a sovereign state any more. It’s got Kurdish, Turkish, Russian, American, Iranian forces blowing the bejasus out of whoever they think is the enemy.
Not sure what you mean by Serbia/Croatia: if you mean the war in Croatia in the nineties that was a war of independence largely between Serbs in Croatia, and of the Yugoslavian army and the Croats. Neither country existed at the time although Croatia was recognised as independent first.
Turkey’s invasion of Cyprus and Russia’s first of Georgia and then Ukraine were unprovoked attacks on sovereign states.