Yemen has been torn apart by conflict since 2014, when Houthi rebels, allied with troops loyal to former President Ali Abdullah Saleh, captured much of the country, including the capital, Sanaa.
A coalition assembled by Saudi Arabia launched an air campaign against the rebels in March 2015 to try to restore the internationally recognised government of President Abd Rabbu Mansour Hadi.
Hadi’s government was toppled by Houthi rebels in late 2014 after the rebels stormed south from their stronghold of Saada, and captured large parts of the north.
Since then, more than 10,000 people have been killed in fighting, millions have been forced from their homes and the impoverished country has been pushed to the brink of famine.
With logistical support from the US, the Saudi-UAE alliance has carried out more than 16,000 raids on Houthi-held areas in an attempt to reverse their gains.
The Arab coalition’s campaign of air raids has devastated Houthi positions, ammunition depots and bases, but has largely failed to pave the way for the recapture of Sanaa.