The British Ambassador to Greece, Ralph Murray raised the matter with Theoharis Rendis, the Greek undersecretary for Foreign Relations, who responded that the Greek government would accept the British interception of one of their ships if it had the backing of the United Nations.[1] :71This led to the adoption of United Nations Security Council Resolution 221 on 9 April which empowered "the United Kingdom to arrest and detain the tanker known as the Joanna V upon her departure from Beira in the event of her oil cargo being discharged there."[4]