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The visitors were accompanied by top diplomats from Germany, France and Italy, reflecting Western concerns over the crisis in the volatile Balkan region.

It was the first such engagement since about crossed into northern Kosovo on Sept. 24, killing a police officer and setting up barricades before launching an hours-long gunbattle with Kosovo police. Three gunmen were killed.

Lajcak said that during their meeting with Kurti, the foreign officials stressed that “the terrorist attack against Kosovo police by armed individuals (that) constitutes a clear and unprecedented escalation.�

He added that the attack also "very clearly underlined that both deescalation and normalization are now more urgent than ever.�

“If there is no dialogue, there might be a repetition of escalation,� Lajcak said.

Serbia and its former province, Kosovo, have been at odds for decades. left more than 10,000 people dead, mostly Kosovo Albanians. Kosovo unilaterally declared independence in 2008 but Belgrade has refused to recognize the move.

Both Kosovo and Serbia want to join the EU, which has told them that they first need to sort out their differences.

Western powers want Kosovo and Serbia to implement a 10-point plan put forward by the EU in February to end months of political crises. Kurti and Vucic at the time, but with some reservations.

The EU and U.S. are pressuring Kosovo to allow for the creation of an Association of the Serb-Majority Municipalities to coordinate work on education, health care, land planning and economic development in communities of northern Kosovo mostly populated by ethnic Serbs.

Pristina fears such an association would be a step toward creating a Serb mini-state with wide autonomy, similar to Republika Srpska in Bosnia.

Lajcak urged Kosovo's government “to move on the establishment of the association of Serb-majority municipalities in Kosovo without further delay.�

“Without this, there will be no progress on Kosovo’s European path,� he said.

The EU suspended funding some projects in Kosovo and halted visits by its top diplomats in July over the issue.

Later in Belgrade, Lajcak said “we have to be very clear that we strongly condemn terrorist attack on Kosovo police on the 24th of September.�

“All perpetrators need to be brought to justice and we expect Serbia’s full cooperation and concrete action in this regard,� he added.

Serbia has denied involvement in the attack, saying it was organized by ethnic Serbs in Kosovo. an ally of Vucic, was briefly detained in Serbia and later released pending further proceedings.

Vucic said on Instagram after the meeting that he believed “we will find a way out of the crisis in the coming period.� He said he expected �important meetings" in Brussels in the days ahead. He did not elaborate.

The last Kosovo-Serbia normalization talks took place in mid-September, before the flare-up in northern Kosovo. It's unclear when another round of meetings might take place.

Kosovo has called on Europe to sanction Serbia, which it blames for the Sept. 24 violence, saying no further talks could be held and demanding higher security measures from Western powers to deter an increased presence of Serb military forces along its border.

NATO has bolstered a , which normally has a troop strength of 4,500, with an additional 200 troops from the U.K. and more than 100 from Romania. It also sent to beef up the peacekeepers’ combat power.

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Llazar Semini reported from Tirana, Albania. Follow him at