So for example blocking Russian engineers and physicists not to work for Iran is possible ? Of course not. The guys think of their own well-being, their children, not Israel, why should they ? If you pay the money, you will get all equipment and experts, no problem. There are a lot of intermediaries and third parties who can transmit material and knowledge, also for money. Blocking this flow is impossible like it is impossible to put an end to software piracy, the same thing.
Woman moderately wounded by firebomb thrown at her car in north J'lem (Haaretz)
from the article: Quietly, Austria is becoming Iran's biggest partner