According to the article Red Sea shipping is down by over 50% due to the Houthi attacks. With the Houthis not attacking Chinese ships it is easy to see who else other than the Iranians are helping them:
One is the falling cost of power-projection. The Houthis aren’t a traditional military juggernaut; they don’t even fully control Yemen. Yet they have employed drones and missiles to control access to vital seas. The Houthis have had help in doing so: Iran has provided weapons and the know-how needed to manufacture them.
But the Red Sea crisis still shows how seemingly minor actors can use relatively cheap capabilities to extend their destructive reach. The second feature is strategic synergy among U.S. foes. The Houthis became more fearsome thanks to mentorship by Iran and Hezbollah. Since October 2023, they have allowed most of China’s shipping to pass without harm. The Houthis have also received encouragement — and, it seems, direct support — from a Russia that is eager to exact vengeance on Washington.
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