Russians know like nobody else the size of haos incurred by faulty nuclear reactor, this why they'd rather have it not too close to their land, in the country where the damage may not be obvious for years. do you really think that Iranian govmt will be in the hurry to admit if something would go wrong? HIGHLY unlikely. Even Americans with their level of technology and size of the available land are not in the hurry to built huclear power stations.
Trump: Middle East would be more stable if Saddam, Gaddafi still in power (Reuters)
from the article: Russia to begin loading fuel into Iran's nuclear reactor next week