Shore anti-ship missiles are a thing. Also you can use regular artillery to shell ships this close to your shores - Ukrainians are able to hit a tank-sized targ

Shore anti-ship missiles are a thing. Also you can use regular artillery to shell ships this close to your shores - Ukrainians are able to hit a tank-sized target on 10+ kilometers with regular 155mm artillery. There is no reason why Iran should not be able to achieve the same thing with ship-sized targets. Additionally Iran has navy drones like Ukraine does. And Russians effectively run away from them and hid in Novorossiysk harbor.