Mossad couldn't punch it's way out of a paper bag. Russia does not need to sneak defensive missiles into Iran. Russia does not fear Israel either, only it's protector the US. Some of the missiles and the system are most likely already in Iran. The Iranian land based S-200 system is ready for an upgrade to the S-300 system. The missiles are easily put in place once a system installation has been completed. No need to move the missiles until the system is working and ready. There will be multiple deliveries of missiles. Iran is after all a very BIG country, of almost 70 million people, most under the age of thirty.
Kerry: Pollard's parole not related to Iran deal (Reuters)
from the article: Report: Ship 'hijacked' near U.K. carried Russian missiles for Iran