It'd be madness for the USSR to nuke Australia unless a US warship is in port or they hit the telemetry stations at Pine Gap or North West Cape. Everything else is far less unimportant than tasking more warheads to critical European and US targets where the initial warheads may not get through.
Canonically the USSR plays a gentleman's nuclear war with the USA, launching just a few warheads at a time before making a half-hearted strike (that somehow takes everyone by surprise!) that is launched in dribs and drabs. In this odd and unrealistic scenario they may nuke an ally 'to show that it could be done', but no one was ever in any doubt anyway. They'd make the point better by nuking Peurto Rico.
It's all academic anyway. Both systems were designed that once confirmed nuke launches or strikes were observed the arsenals were immediately launched, because otherwise they would risk being destroyed in their silos. The crews knew they would be dead shortly anyway.
If there's one part of the canonical backstory I would have GMs looking at addressing, it is the fundamental question of how the nuclear aspect of the war was waged. At present it is ridiculous.
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