(UN News Centre) – The United Nations food relief agency said Tuesday that humanitarian air service into Yemen has resumed, and a ship waiting in international waters for three weeks has now docked in Saleef, stressing that unhindered access to all airports and ports is vital to end the dire situation in the conflict-ravaged southern Arabian country. “The situation in Yemen is currently the biggest humanitarian crisis in the world and aid is urgently required in order to avoid famine,” said Bettina Luescher, spokesperson for the World Food Programme (WFP), at a press briefing in Geneva.