Yemeni state employees register to receive food rations in Sanaa, Yemen, on May 25, 2018. Yemen, which has been in war since 2015, remains the world's worst humanitarian crisis. Three quarters of the population, or more than 22 million people, urgently require some form of humanitarian help, including 8.4 million people who struggle to find their next meal. (Photos: Xinhua)

Yemeni state employees receive food rations in Sanaa, Yemen, on May 25, 2018. Yemen, which has been in war since 2015, remains the world's worst humanitarian crisis. Three quarters of the population, or more than 22 million people, urgently require some form of humanitarian help, including 8.4 million people who struggle to find their next meal.

A Yemeni state employee and his children carry food rations in Sanaa, Yemen, on May 25, 2018. Yemen, which has been in war since 2015, remains the world's worst humanitarian crisis. Three quarters of the population, or more than 22 million people, urgently require some form of humanitarian help, including 8.4 million people who struggle to find their next meal.

Yemeni state employees gather as they register to receive food rations in Sanaa, Yemen, on May 25, 2018. Yemen, which has been in war since 2015, remains the world's worst humanitarian crisis. Three quarters of the population, or more than 22 million people, urgently require some form of humanitarian help, including 8.4 million people who struggle to find their next meal.

A Yemeni state employee carries a bag of wheat in Sanaa, Yemen, on May 25, 2018. Yemen, which has been in war since 2015, remains the world's worst humanitarian crisis. Three quarters of the population, or more than 22 million people, urgently require some form of humanitarian help, including 8.4 million people who struggle to find their next meal.

A Yemeni state employee and his child carry food rations in Sanaa, Yemen, on May 25, 2018. Yemen, which has been in war since 2015, remains the world's worst humanitarian crisis. Three quarters of the population, or more than 22 million people, urgently require some form of humanitarian help, including 8.4 million people who struggle to find their next meal.