I’ve seen stats for the soviet union of 20-26 million dead, civilians included.
This is believed to be the major reason why the soviets subscribed to the threat of Mutually Assured Destruction. They didn’t want a nuclear war with the US with more millions dead.
I also believe Iran doesn’t give a damn about MAD. They are religious fanatics. They just want to have the bomb and I believe they will initiate first use.
Even after the war former Rad Army soldiers would die. If it had been known a soldier had surrendered and managed to live to be liberated or if any soldier had been deemed a coward that soldiers and others like him would be banished from society. This occurred a lot in the wide areas of Ukraine or in the forests that lay around Leningrad. These poor buggers were just ostracized from society and left to fend for themselves. They were called called ''The Men of The Forest''.
The Soviets admitted to 20,000,000 in their official history, which is probably quite low. I have seen figures of 25 million as well and one Russian politician a few years back quoted 35 million which may be a bit high. Also note that the 54 million figure includes the Sino-Japanese conflict which was very costly.
If Iran tries first use and detonates a bomb in Israel the Israelis will probably flatten about two dozen carefully chosen targets. A few hard targets such as known command posts and weapon facilities would be hit. A few symbolic targets such as Teheran and Qom might be destroyed. And then they might take out the only gasoline refinery Iran has. And that reactor at Bushehr. Nasty mess, that last one.