The Houthi-led government in Yemen announced that it had forced an Israel-bound ship to turn back as it was sailing through the Red Sea in violation of the warnings issued on Saturday
[Ansar Allah’s Prime Minister] Bin Habtoor clarified that this naval blockade will persist until Gaza's siege is lifted and essential supplies like food and medicine reach the Palestinian population.
In full seriousness, beyond posturing and making an ideological statement, how will the Houthi Movement enforce this blockade in any way? They have no navy, no modern anti-ship missiles, no naval Air Force, or any meaningful way to affect shipping in the Red Sea without getting wiped off the face of the Earth by UN anti-piracy naval and air forces in stationed in Djibouti.
They've already been using drones to harass Israeli affiliated ships and even seized one. They don't have to be able to completely stop shipping, just to make it riskier and more expensive to do. That puts direct economic pressure on Israel. There's a good article talking about this in more detail here https://new.thecradle.co/articles-id/14235
With what? They have no naval military craft at all, zero. The most they have is drones, though they have been noted to be useful only with harassment engagements.
Also they absolutely do not have free reign over the Arabian and Red seas. That is one of the most high defended areas in the world, with anti piracy operations from UN nations constantly patrolling, destroying, and capturing pirates and smugglers. The Chinese, Americans, Russians, French, and British all have their own naval base and airfield in Djibouti for the express purpose of supporting those operations. Plus air and naval assets from dozens of UN countries.
Bab el Mandab??? You’re kidding right? I’m sure trying to capture or destroy a ship 25 meters away from the combined naval and air assets of nearly 45 countries is going to go well.