It looks like a Lun class, of which only 1 was built. On top of the fuselage/hull...not sure which? you can just make out where 6 SS-N-22 anti ship missile launchers were mounted. The Lun class was a fair bit smaller than the original Caspian Sea Monster the KM, although no less impressive. There was a good programme some years ago on Channel 4 about these craft, I'm sure at the time it was made there was a half completed one somewhere that was going to be as big as KM if not bigger, alas the money ran out. There was also a whole load of smaller craft designed, some got as far as prototypes but most never got built. The designs were pretty out of this world, they really wouldn't have looked out of place in Star Wars.