Tensions are high over car plates between the government of Kosovo and the ethnic Serbs in the Serb-majority municipalities.
Pristina refuses to delay the end-of-month deadline, demanding that all those residing in Kosovo swap Serbian-issued car number plates for Kosovar ones.
Kosovo, which is predominantly ethnic Albanian, has sought to compel Serbs to accept Pristina's authority in routine bureaucratic matters since it declared independence in 2008.
Prior to the declaration, the former Serbian province was a UN protectorate since the 1999 NATO military intervention aimed at stopping the ethnic cleansing and repression of Albanians by the Belgrade forces under the control of strongman Serbian President Slobodan Milošević.
Its independence has been recognised by the US and all but five European Union countries, but Serbia, backed by its allies Russia and China, refuses to do so -- claiming the declaration of independence was done unilaterally -- as do most ethnic Serbs inside Kosovo.
After the withdrawal of Serbian forces, the authorities in Belgrade have set up parallel state services -- including car registration offices -- in other parts of the country.
Pristina contests the validity of those licence plates, claiming that the switch to Kosovo-issued plates is in accordance with the 2011 Brussels agreement between the two sides.
Despite the flare-up over the issue, the US government spokesman Ned Price said the White House is confident that both Kosovo and Serbia can reach an agreement peacefully in the coming days.
Kosovo's Prime Minister Albin Kurti says the country is simply exercising its right to sovereignty.
"We have already postponed the deadline. Instead of being on 30 September, the last date is 31 October where all
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