And Israel's red line is now crossed. Once the system is in place by the end of THIS YEAR, Iran will be largely immune from an attack by Israel. From Ynet News:
DUBAI - Russia has delivered the missile part of S-300 surface-to-air defence system to Iran, Tasnim news agency reported on Monday, moving to finish the delivery of all divisions of the system to Tehran by the end of this year.
"The first shipment of missiles of S-300 missile system has recently entered Iran that shows Iran's determination to equip its air defence circle with this system," Tasnim news agency, which is close to the Revolutionary Guards, reported.
Russia's agreement to provide Iran with S-300 has sparked concern in Israel, whose government Iran has said it aims to destroy.