When the Soviet FOBS missiles were in service I speculated that attacking a few key targets in the southern hemisphere might have been one of their roles. Post FOBS maybe an older SSBN might have been made available for this type of task. One can speculate endlessly I suppose about this type of topic. (If anyone can point me towards any Russian sources re this I would be interested.) I will agree that a stereotypical "MAD" style attack against targets in the Southern Hemisphere seemed very unlikely to me for a variety of speculative reasons.As has been discussed numerous times in many previous threads, this assertion falls down when you look at what the Soviets actually had in the way of delivery systems and start considering reliability and weapons failures as a factor. The Soviets (and the United States) had an actually pretty limited number of platforms capable of hitting Australia or New Zealand, and those platforms were also some of their most powerful weapons against the other side's homelands (in terms of having high throw weight, numerous decoys, etc.) Moreover, these weapons were not in any way 100% reliable--missiles could fail, warheads could fizzle, busses could malfunction, and so on, to say nothing of the effects of enemy action like sinking SSBNs. Finally, the size of Australia means that multiple missiles would be required to hit more than one or two targets, just because MIRVs can't actually disperse that far and most Australian targets are quite far from each other.
When you add all this up, it quickly becomes apparent that striking Australia would be more trouble than it could possibly be worth, even if you're "thinking ahead" to try to take out potentially hostile future countries. Every missile dedicated to Australia means a half a dozen or more warheads removed from hitting the United States, which means that you're taking some targets in the United States itself off the board or increasing the probability that they will survive the exchange. New Zealand is even worse, of course. You would need far, far more very heavy long-range missiles than the Soviets built to make it worthwhile to strike the ANZAC nations.
(And they could forget about hitting the Southern Cone altogether; even the R-36M with a 16 000 km range couldn't reach that far from Soviet borders, and they only had about 40 of those with huge 20 MT warheads, definitely not worth wasting on Buenos Aires or Santiago even if it could)
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