NATO said on Friday it is increasing its peacekeeping presence in northern Kosovo as a result of escalating tensions with neighboring Serbia, as the U.S. called on Serbia to withdraw a military buildup on the border with Kosovo. The heightening of tensions comes after about 30 heavily armed Serbs stormed the northern Kosovo village of Banjska last Sunday. “We need NATO because the border with Serbia is very long and the Serbian army has been recently strengthening its capacities,” Kosovo Prime Minister Albin Kurti told the Associated Press. He described the buildup as “a very destabilizing development” and called on Serbia to withdraw these forces. Kirby added that U.S. Secretary of State Antony Blinken had called Serbian President Aleksandar Vučić to urge “immediate de-escalation” and a return to dialogue.