The author’s speculation on why Iran would want Russian troops is way to complicated. They want Russian troops because they believe the US will not attack Iran if they are there. No doubt they would be billeted near some Peaceful Nuclear Power Research Center.
Say, didn’t Saddam do the same thing, and call them human shields? It’s not even an original Iranian ploy!
The USA would not attack anyway without a green light from Russia. It was so in Iraq, both GW I and GW II.