US Secretary of State Antony Blinken urged Kosovan and Serbian leaders Thursday to ease tensions, warning they were putting aspirations of European integration at risk. "We call on the governments of Kosovo and Serbia to take immediate steps to de-escalate tensions," Blinken told reporters at NATO talks in Oslo. "We support the process of Euro-Atlantic integration for Kosovo and Serbia. But the current escalation hinders rather than helps the efforts to move in that direction," he said.