Oil from Russia bound for Hungary and Slovakia , via the Druzhba pipeline  that first goes through Belarus and Ukraine, started flowing again on Wednesday after a monthslong interruption.  The stoppage had been a source of severe tension between Ukraine and Hungary and Slovakia , which intensified amid the added strain on energy prices caused by the war in Iran and the wider Middle East .  Restarting supplies should also unlock a massive €90 billion EU loan for Ukraine originally agreed in