The UN charter is against it.  Article 2 of the UN charter requires all member states to ‘refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state’.  Security Council Resolution 1244 (1999), which authorised the deployment of an international force to Kosovo to manage security and governance, explicitly affirmed the commitment of all Member States to the sovereignty and territorial integrity of the Federal Republic of Yugoslavia (the name for the Union of Serbia and Montenegro which ended in 2006) and the other States to that region. [1]  Recognition of an independent Kosovo is a violation of the territorial integrity of Serbia and thus a violation of the rights of the Serbian state.  [1] UN Security Council Resolution 1244