Major General Angelo Michele Ristuccia, leader of NATO's KFOR peacekeepers, says his troops are in a position to control the situation and warns all sides to "refrain from provocative shows of force."
President Vucic said Belgrade is concerned over the treatment of the Serbian minority in northern Kosovo and called on the Western military alliance for protection.
Serbia's President Vucic said the following period will be a very difficult political struggle.
NATO's forces in Kosovo announced they are ready to intervene if stability in northern Kosovo is threatened.
Voting ended at 7 pm (1700 GMT) with some 1.9 million voters eligible to cast ballots to elect mayors for 38 municipalities and some 1,000 town hall lawmakers.
The two Balkan neighbours had been at loggerheads for more than 10 days after Kosovo banned vehicles with Serbian registration plates from entering its territory reciprocating Belgrade's years-long practice.
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