Author: Matthew Karnitschnig, Una Hajdari

BELGRADE — A long-simmering — and at times violent — standoff between Kosovo and Serbia over the status of majority Serb enclaves in northern Kosovo looked poised to go back on the boil as the leaders of the two countries ratcheted up the rhetoric with dueling insults and accusations this week. After Kosovo Prime Minister Albin Kurti accused him of “irrationality,” “desperation” and of pursuing an “aggressive campaign for new conflicts,” Serbian President Aleksandar Vučić shot back in an interview with POLITICO. “If irrationality and aggression is to have democratic elections … OK, many thanks to him,” Vučić said.…