Yemen has been brought to the brink of collapse by almost a decade of civil war.
Back in 2014, Houthi forces, backed by Iran seized the capital.
A Saudi-led coalition, supported by Britain and America, intervened. But the Houthis have not been dislodged and still control Sanaa and the north, where most of the population live.
Few places have suffered more than the city of Taiz which has been besieged by Houthi forces for more than 3,000 days.
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