Iran already admitted that it was their own fault and they thought that it was a US military plane, I don't see why they couldn't identify it as it was took off from the air port.
Also Russians condemned this act as soon as Iran accepted it. I don't think there is any other side to this story. It was a human error and sadly it's too big to regret.
damit islam works good, don't lie or you go to hell.
iran is much more trustworthy, than the usa.