They are asking for war.
They're likely to get it. They're not North Korea. They have no bargaining chips.
What are the bargaining chips of North Korea? Saving South Korea? I don't see much difference in what Iran's bargaining chips might be?
North Korea has actual, working nuclear bombs, and the missiles to launch them. They could hit Japan or South Korea with no warning, and have an outside chance of hitting U.S. soil if they tried. (Only Alaska, Hawaii, or maybe one city on the Pacific Ocean like Seattla or L.A. if they were really lucky, but that's enough.)
Iran has nothing.