^^Many of these Fateh-110 solid fuel missiles were produced 20-25 years ago and are at the end of their lifespan.
Now, these old missiles have a chance of being used in mass in Ukraine instead of being phased out of service.
Also, because many of these missiles are old, expect many of them failing in flight.
By selling these missiles, Iran will earn a lot of money and this will allow it to substitute old Fateh missiles with new Raad-500 missiles in its arsenal.
So war in Ukraine provides an opportunity for Iran to get rid of its stockpile of old missiles while earning a lot of money in the process.
Also, if Iran is ready to sell 400 ballistic missiles to a foreign country, how many missiles does Iran really have in its arsenal? Probably General McKenzie's estimation of 3000 ballistic missiles in Iran's arsenal is wrong.