The Houthis have intensified their attacks on the forces of Yemen’s Internationally Recognized Government (IRG) over the last week but have also widened their campaign by mounting very damaging attacks on infrastructure in Saudi Arabia. Targeting of civilian airports in Saudi Arabia, which has led to the temporary closure of Riyadh International Airport, places further pressure on transport routes into and out of Saudi Arabia, which have also been exacerbated by continued drone and missile attacks on oil pipelines and...