Changed the subject now and went with realpolitik did you. You can't just ignore it like that. You'll have anarchy. Either rules apply or they don't. You can't have it as you want it per specific case. Either international law applies or not. Sui generis is not recognised.
Reality now that becomes history tomorrow is being changed all the time by good and bad actors. It looks to me you are the one who advocates for 'boots on the ground' reality and history. Reality today is that Serbs in Kosovo are oppressed. I don't see it like you that Serbia is agitating anything, especially not for war. The status quo works more in Serbia's favour. They are developing into a decent to live country slowly, connected with EU and wider world. Data is there. Why would they risk it? I know, I know, Serbs are the bad guys, so easy to point finger at, no matter who did what.
These three countries don't claim anything. They are recognised as such by the UN. The claim is actually on the other side.