Turkey is not building ICBMs.
Intercontinental Ballistic Missiles and Intermediate Range Ballistic Missiles are very different.
And as of right now, we are talking Conventional Strike, not Nuclear.
These Zios will not stop with Iran, I see them talking about Turkey, but I have also seen them talking about "Denuclearizing Pakistan" and they seem to be really talking up their new relationship with India, and the Greek thing they have been getting all buddy buddy with Greece.
Turkey needs to prepare for all contingencies here. And have cooperation and partners, because clearly they are picking off countries one by one, anyone with capacity that isn't subservient.
Anyone that thinks they will allow Turkey to grow and get stronger in defense is fooling themselves. They will either attack or coordinate an attack whether economic or physical whether by themselves or via the countries they have influence over. Saudi has never threatened them, yet they are averse to Saudi getting F-35s or getting strategic platforms. Historically they even tried bombing Pakistan to prevent a nuclear Pakistan, but b/c India at the time didn't have a hindutwa govt and one that was more risk averse, India refused to allow them to use India territory, this current govt is a lot less averse to reckless attacks.
Coalitions and alliances are forming against Turkish interests, whether to the West or the East, in that environment, the capability if need be, needs to exist. We are already looking at partnerships with Egypt and Saudi, and Pakistan plays a key role in the Saudi dynamic, as well as Turkey's defense relationship with Pakistan.
If there is ever a need for a non NATO nuclear deterrent, they will never allow turkey to build one, it would have to come via trusted allies.