So you'll have a permanently aggrieved population with nothing to lose saturated with know-how and materials for building missiles and drones who will just keep taking pot shots at ships and possibly commercial airliners. They don't have to "close" the straight - just make it hazardous enough that it becomes permanently very risky to sail through there. They can go dormant for 3 months and then send 30 drones at a single ship.
I'm not sure who in the strategic planning decided that no system of government for 90 million people was a good idea, but it seems quite insane to me.