At separate talks with the troika of international mediators on the province's status, Serbians and Kosovar Albanians failed to reach a breakthrough, and Kosovo's negotiators insisted that a plan foreseeing the province's eventual independence drafted by United Nations special envoy Martti Ahtisaari could not be renegotiated.
Foreign Minister Vuk Jeremic said: "There is a broad spectrum of opportunities to respond effectively to any acts that may damage a country's foreign policy or territorial integrity."
Jeremic said he shares the position of Serbian Prime Minister Vojislav Kostunica, who said that Serbia would respond in kind to any threats.
Kostunica said Thursday: "Serbian authorities are developing various 'reaction models' in the event of the least favorable solution for the country on the future status of Kosovo, namely a unilateral declaration of independence by the Kosovar Albanian leaders."
Russia's envoy the meeting, Alexander Botsan-Kharchenko, said after the talks that "there was no breakthrough - but none of us had expected a breakthrough."
Kosovo has been a UN protectorate since NATO's 78-day bombing campaign against the former Yugoslavia ended a conflict between Serb forces and Muslim Albanian separatists in 1999. The province has been striving for independence from Serbia ever since.
The Serbian prime minister said all measures had to be taken to prevent Kosovo from proclaiming its independence unilaterally, as such a move would set a dangerous precedent, and seriously undermine the authority of the UN.
The diplomatic troika made up of envoys from the European Union, the United States and Russia launched a 120-day effort to end the stalemate over Kosovo. The troika has to find a compromise by December 10 between Kosovo's demands for independence and Serbia's rejection of Kosovars' bid for secession, and its offer for "essential autonomy."
Moscow, a traditional ally of Belgrade, has consistently blocked plans for Kosovo's independence, using its UN Security Council veto.
