Hezbollah's Iranian V2-alike can do to Tel Aviv what the German V2s did to London. If that happens, Israel will have to take on the proximate attackers - Iran and Syria.
The weapon (my ellipsis):
(Is the) Iranian-manufactured Zelzal-2 surface-to-surface missiles (a knock-off of the old Soviet FROG-7) ... Using an inertial guidance system, these missiles are reportedly accurate to under 100 (yards) at their maximum range, which is estimated to be about (125 miles).It's two thirds of the V2 in size, range and warhead, but much more accurate (if Iranian inertial guidance works!), plus it's much quicker to launch (liquid fueling the V2 took ages). Like the V2, the Zelzal is hard to spot from the air - in spite of heavy bombing of their launchers and logistics, the Germans fired about 1400 at London before we overran their launch sites.
Iran got the Zelzal-2 into production about ten years ago, after a decade of development effort. Iran received technical help from North Korea and China. The 3.5 ton rocket is 27 feet long, two feet in diameter and carries a 1,300 pound warhead. Israel first detected Zelzal-2's in southern Lebanon four years ago. The Zelzal-2 is a solid fuel rocket, so it can be set up and fired in less than fifteen minutes.
Iran isn't trying to hide its intentions:
Iran admitted for the first time on Friday that it did indeed supply long-range Zelzal-2 missiles to Hizbullah.
Secretary-general of the "Intifada conference" Mohtashami Pur told an Iranian newspaper that Iran transferred the missiles so that they could be used to defend Lebanon
This may come to nothing - the IDF says it has destroyed a bunch of them, it has interdicted their re-supply from Syria, and the Israeli BMD should stop any they do launch.
But Iran is throwing billions of dollars of weaponry at Hezbollah, and defensive systems do fail. So if Tel Aviv is hit, Israel must inflicting serious pain on its tormentors.
Iranian targets are their nukes, missiles, army. Syrian targets are its air force, armor and leadership.