The U.S. ambassador to Serbia says the United States has received Kosovo’s request for the purchase of Javelin anti-tank missiles.

Serbian police say they have detained at least 38 people who took part in a protest against reported widespread irregularities during a recent general ballot that declared the governing populists winners of the parliamentary and local councils’ elections.

Serbia’s president has demanded that a NATO-led peacekeeping force in Kosovo take over for the national law enforcement agency in northern Kosovo.

The European Union and the U.S. have questioned Serbia’s commitment to join Europe’s 27-nation bloc after Belgrade signed an agreement with Moscow pledging long-term “consultations” on foreign policy matters amid the Russian aggression in Ukraine.