A brawl erupted in the Kosovo parliament after an opposition politician threw water on Prime Minister Albin Kurti.
Mr Kurti was speaking about government measures to defuse tensions with ethnic Serbs in the country's north.
Kosovo opposition parties have criticised Mr Kurti's policies in the north that have strained relations with key Western allies.
The US and European Union have pressured Mr Kurti to help calm the situation after violence broke out in May after police-backed ethnic Albanian mayors took office following an election that the ethnic Serb majority in the area had widely boycotted.
Dozens of people were injured in clashes between local Serbs and Kosovo police and Nato-led peacekeepers, fuelling fears of a conflict similar to the one in 1998-99 that killed more than 10,000 people.
On Wednesday, Mr Kurti announced he would reduce the number of special police officers stationed outside four municipal buildings in ethnic Serb-majority areas in northern Kosovo, and hold new mayoral elections in each of the towns.
The move has angered the opposition, who argued that Mr Kurti "experimented" for months and jeopardised Kosovo's international position only to back down later.
Legislator Mergim Lushtaku, from the Democratic Party of Kosovo, approached Mr Kurti while he was speaking and threw water at him, triggering the brawl.
Earlier, Mr Kurti's deputy Besnik Beslimi had torn up a drawing mocking Mr Kurti that the opposition had given the prime minister.
Local media said Mr Kurti was escorted out of the assembly hall during the chaos.
Mr Kurti has said he was applying law and order in northern Kosovo with the deployment of police and new ethnic Albanian mayors.
The US and the EU had urged him to keep the mayors in different locations away from the north until the situation is resolved.
Kosovo is a former province in Serbia whose 2008 declaration of independence Belgrade does not recognise.
Most ethnic Serbs in Kosovo have also refused to acknowledge Kosovo's statehood, which is backed by the United States and most EU nations but not Russia and China.
Serbia had heightened army combat readiness and threatened a military intervention in response to tensions in the north, which borders Serbia.
Belgrade pulled out of Kosovo in 1999 after Nato bombed the country to stop the onslaught against ethnic Albanian separatists.
The EU has told both countries they must reach a solution to their dispute through an EU-mediated dialogue in order to join the bloc.
Western officials have stepped up efforts to bring the two sides closer together, fearing further instability in Europe as the war continues in Ukraine.
Nato has sent additional troops to its peacekeeping mission in Kosovo to boost security.
