The United States says it won’t block Russia’s attempts to establish a UN tribunal to investigate allegations that Kosovo’s ethnic Albanian wartime leaders killed hundreds of Serb civilians. The country’s lawmakers rejected amendments to the constitution to allow a Western-backed court to deal with the claims. The US Embassy in Kosovo said it was ‘deeply disappointed’ by Friday’s vote. A 2010 Council of Europe report claimed former rebel leader turned politician Hashim Thaçi and other Kosovo guerrillas ran a criminal ring in 1999 and that some victims were allegedly killed for their organs to be sold on the black market. The 120-seat legislature voted in favour of the amendments, but failed to secure a two-thirds majority to approve the changes. (Hashim Thaçi served as the prime minister of Kosovo from 2008 to 2014 . Just weeks after assuming the premiership, he oversaw Kosovo’s declaration of independence from Serbia.)