A Kosovo court said on Wednesday that some parts of an EU-brokered deal with Serbia are unconstitutional.
The deal to form an association of Serb-majority municipalities in Kosovo included "principles … not entirely in compliance with the respective constitutional standards," Kosovo's Constitutional Court said on Wednesday.
The statement came after Kosovar President Atifete Jahjaga submitted a request to evaluate contitutionality of the deal.
Jahjaga called on "all institutions and political spectrum to respect the verdict of the Constitutional Court" and urged political parties "to restart political dialogue in Kosovo and to return the country back to normality."
The Director of the Office for Kosovo in Serbia Marko Duric told local media after the verdict was announced that the deal was valid for Belgrade and any renegotiation would "open a Pandora’s box."
Serbian Prime Minister Alexander Vucic and Kosovar Prime Minister Isa Mustafa signed four agreements in August, granting Serbs in Kosovo greater local powers and some financial support from Belgrade.
Kosovo opposition parties are strongly opposed to the agreement, blocking the normal functioning of parliament since September and have held protests against the government.
Several opposition parties such as the Self-Determination Party, the Alliance for the Future of Kosovo and the Initiative for Kosovo, said that the agreement would pave the way what they called the "Bosniazation" of Kosovo.
The parties also oppose another agreement on a border with Montenegro.
Many opposition MPs were arrested for throwing tear gas in parliament which has caused the worst political crisis in Kosovo since 2008 when the country declared independence from Serbia.
Kosovo declared its independence on Feb. 17, 2008 and is recognised by nearly 110 countries, including Turkey, France, Germany, the US and the UK.
Russia, Serbia and China have not recognised Kosovo’s independence.
Kosovo was a Serbian Province before it declared its independence from Serbia, which is now populated by nearly 1.8 million people, 90 percent of whom are Kosovo Albanians.