A remarkably naive view of how difficult it would be to persuade anyone to launch aircraft into any conflict where the Serbs have latest generation SAW - let alone commit to offensive operations…
I am not even checking what is happening between Serbia and Kosovo.
Because there are 2 foreign military commands in Kosovo: an American and an Italian, which have an US Air Force F-16C Block 40 wing at Aviano and an Italian Air Force Eurofighter wing at Gioia del Colle and an F-35A wing at Amendola, plus an Italian Army paratroopers brigade at Pisa & a US Army airborne brigade at Aviano as backup.
If the Serbians do something stupid it will take 2 hours for the first of 100+ fighter-bombers to appear above the Serbian troops... & kill them all.