Let me clarify something here:
Depressed trajectory / quasi-ballistic missiles is the difficult goal to master.
These sacrifice range and payload performance and need much more (thermal heating, actuator performance requirements) to become feasible. A ballistic missile like the SCUD or V-2 needs no solutions for those issues, it simply goes ballistic. Intuition also told me back in the days that leaving the atmosphere and re-enter it would be a much larger achievement than flying a depressed one at the edge of the atmosphere... but the truth is the opposite.
The art of the Iskander and why it became so famous is such a depressed trajectory.
The Fateh family is a very elegant solution from Irans missile school and is a real missile, not just a guided rocket. But from the Zolfaghar onward it likely is fully on pair with the Iskander in terms of maneuvering and anti-ABM solutions.
The Zolfaghar/Dezful CAN fly quasi-ballistic if a ABM system is present, like all other missiles they would sacrifice range to achieve that. The key to a carrier-killer variant of them is exactly this capability: depressed trajectory approach, aero-breaking, vertical 90° dive with activated Fathe Mobin like seeker with random high-G maneuvering in order to neutralize Aegis ABM system. That's probably the monster the U.S Navy fears Iran has.
The North Korean Iskander flew 690km, not above 50km altitude to make a sudden 90° vertical dive with maneuvering. Compared to it, the Zolfaghar/Dezful have even higher maneuvering capability.
The North Korean missile saves one critical subsystem to achieve that operation (vernier thruster), Irans Zolfaghar/Dezful saves two critical subsystems.
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