The Saudi-led military coalition in Yemen defied the UN and launched a major assault on the port of Hodeidah, despite warnings that the destruction of the country's most vital lifeline could lead to the deaths of 250,000 people.
The offensive sets the stage for what could be the largest battle of the three-year war, as Yemeni forces supported by Saudi Arabia and the UAE attempt to clear Hodeidah of Houthi rebel fighters aligned with Iran.
Hodeidah is a city of 600,000 and the attack is the most ambitious operation launched so far by the coalition, raising fears of bloody street battles with civilians caught in the crossfire.
Around 70 per cent of Yemen's imports come through Hodeidah, including the vast majority of its food, and the UN conducted a week of frantic shuttle diplomacy to try to avert the attack.
But the fighting began today, with Yemeni fighters supported by the UAE attacking the southern edges of the city as coalition warplanes launched a wave of air strikes.