I doubt the Russian AMB would even work over Moscow for a few missiles. I bet we have over 200 aimed at it, so that wouldn't be a big deal at all to take it out.
I seriously doubt Russia would deserve to get hit though from us. Depends on how big the exchange gets. If it starts spiraling out of control...
I thought the Russians were supplying Iran with weapons and technology. If that's the case, and Iran is behind a future nuke attack on the US, then yes, we would indeed have reason to target Russia. Payback and retribution (and justice).
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I seriously doubt Russia would deserve to get hit though from us. Depends on how big the exchange gets. If it starts spiraling out of control...