Ukraine’s foreign minister urged the EU Monday to overcome Hungary’s resistance to an embargo on Russian oil and then look to “kill” all of Moscow’s exports to starve its war machine of funds. Budapest has been holding up a push by Brussels, backed by other European Union states, to ban Moscow’s vital oil exports, the cornerstone of a planned sixth package of sanctions, arguing that it would hammer its own economy. “We are unhappy with the fact that the oil embargo is not there,” Ukraine’s top diplomat Dmytro Kuleba said after meeting EU foreign ministers in Brussels. “It’s clear who’s holding…