Yes but used in such a role, there would be little that's special about it. Nuclear armed torpedoes and short range missiles aren't new. What's special about KANYON is specifically it's range and payload (but frankly the payload could be a tenth of what's advertised and it would still be a chilling weapon, so really the range is the real interesting part.)
It's likely it would never be operated near it's maximum range, but would nevertheless be operated at few thousand kilometers. The reason for this is because its likely host, the Belgorod, would be safest operating under the polar ice cap where sonar is, relatively speaking, a clusterfuck.
No, INF treaty is about ground launched weapons, the same thing launched by boats are fine.
On of the things the Russians did was to take a boat launched weapon capable of INF prohibited ranges, putting it on the ground but only testing it out to ranges allowed by the INF. )I think they put something heavier on it so it wouldn't go as far as the naval version.)
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