(FILES) In this file photo taken on September 21, 2019, a fighter loyal to Yemen's Huthi rebels mans a machine gun in the back of a pickup truck during a tribal meeting in the Huthi-held capital Sanaa, as tribes donate rations and funds to fighters loyal to the Huthis along the fronts. Yemen's Huthis were defiant after the United States moved to brand the Iran-backed rebels as terrorists, a last-minute move in defiance of aid groups who fear it will tip the country into famine. Unless Congress blocks the decision, the blacklisting will take effect on January 19, one day before the inauguration of President-elect Joe Biden, whose aides had hoped to mount a fresh push to end Yemen's devastating six-year-old war. / AFP / MOHAMMED HUWAIS
A fighter loyal to Yemen's Houthi militias mans a machine gun in the back of a pickup truck during a tribal meeting in Sanaa. AFP

UN demands ceasefire after major Houthi offensive in Yemen