Also, its not just about the big boats, since missile saturation is very important in modern surface naval combat, China has a shitload of smaller shipyards that can churn out Type 22s and Type 054As if the need arises at a scale that US shipyards + their south Korean vassals can’t hope to achieve.
Iran has some decent missile tech and proof that they are willing to use it. They may or may not have nukes at the moment but if it comes to that they definitely have the means to make nuclear warheads on short notice. They should definitely start though, having the ability to make nukes in a week means nothing if issrael decides to do a first strike.