The region is one constituency, and its wars are linked to each other no matter what the distance between them. This has been the case since revolutions erupted at the beginning of 2011. Fighting erupted and has spread widely in Yemen since mid-2014, after the Houthis took over the city of Imran and occupied the capital Sanaa. The situation escalated into all-out war after the Houthis besieged the legitimate president and his government.
In order to defend itself and further pressure Iran, Riyadh will need to support Syrian opposition groups more