Kosovo's opposition has used tear gas to disrupt a parliament vote on a border demarcation deal with Montenegro.

The Self-Determination Movement party used tear gas in the Assembly building when the vote was due to start Wednesday, and all lawmakers had to leave the hall.

The 120-seat parliament was expected to vote with two-thirds to ratify the 2015 deal.

The opposition party says that the border deal would mean Kosovo loses 8,200 hectares (20,000 acres) of its territory. The previous government and international experts deny that claim.

The deal is set as a precondition by the European Union for Kosovo's citizens to freely travel within its visa-free travel zone known as Schengen.

Montenegro, which has approved the deal, recognizes Kosovo's 2008 independence from Serbia, which Belgrade still rejects.