Two scenarios for the Yemen war

• The attacks by the Iran-backed Houthis on Saudi Arabia have pushed the war in Yemen to a new level.
• The targeting of civilian infrastructure, including airports, which has killed at least a dozen people and injured hundreds, has left no room to maintain the “red lines” that previously outlined the limits of escalation.
• This is a reckless gamble by the Houthis which is not in their interest.