This new attempt to destroy the Iranian state is easily the most evil crime the West has done in my lifetime (or rather, it will be, if successful). What is in store for the Iranian people if this attempt is successful is more Libya.
The Iranian regime has no friends. Not even among its neighbors in the Middle East. A significant part of the Iranian people despise them just as much as the Israeli do.
Putin can offer the regime the same assistance that he offered Assad last year; a safe haven for Khamenei and his ilk in Moscow.
I hope some day will come where the regime is permanently dismantled and the Iranian people can decide for themselves again and bury the hatchet with former and present enemies.
As to the first point, Israel's actions over the last 4 days are in fact about the worst thing they could possibly do from the perspective of trying to undermine the Iranian regime. Even Iranians who hate the Islamic Republic have no desire to be slaughtered for the sake of Israel's "security."*
As to the third point, the idea that democracy in Iran or the wider middle east will mean Iran living at peace with "former and present enemies" is a utopian fantasy, for two reasons. One is that an Iranian government that accurately reflected popular will in Iran would still be at war with the Zionists, it would simply be prosecuting that war more effectively than the present regime is capable of doing. Second is that it is explicitly Israeli-US policy to maintain Israel's "qualitative military edge" over
any possible regional coalition.
This second point is more important because it ultimately lays bare the contradictions of a US that says it wants a peaceful, liberal-democratic middle east but in fact lends total unconditional support to a colonial vanguard "state" which will never allow the middle east to develop because to do so would destroy that state's qualitative military edge. How can Israel remain assured of its ability to defeat a prosperous, liberal-democratic Iran with 10 times its population? Obviously, it cannot, and so such an Iran can never be allowed to exist.
Israel is therefore essentially locked into a perpetual game of murderous whack-a-mole, using whatever methods are necessary to prevent the emergence of any internally-stable and prosperous state in the region: preferably by covert manipulation of politics, e.g. by stirring up conflict between ethnic groups, as we've seen in Lebanon and Syria and in the territory of Palestine itself, and when that fails, military chevauchée which is designed simply to destroy the physical infrastructure on which prosperity relies.
The problem is that Israel cannot produce enough munitions by itself to do this for very long, and its hegemon patron has both a hollowed-out defense-industrial base and other pressing geopolitical commitments. There are also serious political questions within Israel which have only been drowned out by the euphoria over Israel's initial success against Iran but which are far from settled.
* I put "security" in scare quotes here because of course Israel could have all the real security it wanted if it came to a real settlement with the Palestinians and the neighboring states, but it would rather act like the Nazis in Poland while cosplaying as a Bronze Age kingdom.