The USA has been trying to escalate and expand this conflict since the beginning.
Blinken visited Kosovo in June, and immediately the Kosovo Regime started negative actions against the Serb cities.
Now Serbia itself reacts, and this is reported like it was completely out of the blue and nothing happened prior (just like the Russian operation against Ukraine).
If Blinken encouraged Kosovo to do to the Serbian enclaves what the Ukrainians did to the Russian enclaves, you must wonder why the State Department wants to encourage Serbian retaliation. Then we have the Armenian-Azerbaijani conflict reigniting. Is that war another attempt to hit the fringes of the former Soviet/Tsarist Empire? Perhaps the possible attack by the Serbians is being encouraged by Russia in order to counter the situation in western Asia, which may have been provoked by the West. We have the recent coups in Niger in West Africa and Gabon in Central Africa, in both cases taking out a French aligned civilian government and in the Niger case, supported by the Russian mercenary organization, the Wagner Group.
All these events are connected in a worldwide struggle between the Western nations and the Chinese-Russian-Iranian axis.