What could stop the Houthis’ advance across Yemen?

• Already war-torn and under blockade for more than a decade, Yemen risks descending into another civil war.
• The Houthis have tightened their grip on islands in the Red Sea, giving them control over a vital global shipping route.
• Yemen’s government forces have carried out air attacks against the Iran-backed Houthis to repel their advances, as the rebel group has been gaining ground in government-held positions in the past week.