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To be clear, a Poseidon is not a cruise missile; it's a torpedo. It has different characteristics from an Oscar class loaded with Granits. Being a torpedo (which doesn't fly) a Poseidon can only attack things on or next to the water (probably ports / coastal cities.) Because a Poseidon is slow (relative to a missile) it seems an unlikely choice for a first strike attack; it's more likely to be intended as a retaliation weapon that's hard to intercept. Russia may also be planning on creating Poseidon "silos" on the seabed of the Arctic Ocean. Possibly related to this, Russia has a single submarine capable of carrying a Poseidon, the K-329 "Belgorod" which is a stretched Oscar-II. It can also supposedly operate as a mothersub for small submarines like the Losharik; the plan may be to use a submarine like the Losharik to install Poseidons on the bottom of the Arctic Ocean to act as a 'Dead Hand' system. However after the Losharik fire, I wonder what their plans are...

The biggest advantage of a Skyfall missile over a Granit is obvious; range. If a Skyfall missile works as they plan, there'd be no need to sneak an Oscar anywhere close to the target, or even use a submarine at all. Furthermore it could strike inland targets beyond the range of a Granit fired from an Oscar sitting in coastal waters. An Oscar would need to sneak it's way up the Mississippi River if it wanted a chance of hitting a target in Nebraska with Granit missiles, which leads into:

ICBMs. With respect to ICBMs you're mistaken. Russia does have a variety of ICBMs and SLBMs still in service with plans for more. They have enough already to easily overwhelm America's extant ABM systems, which are primarily a defense against smaller nuclear threats (e.g. North Korea.) Poseidon and Skyfall are hedges against the possibility that ballistic missiles are rendered truly obsolete by ABM systems, but that scenario hasn't [yet] become reality.

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