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Project 877 Kilo class
Project 636 Kilo class
Diesel-Electric Torpedo Submarine

Not surprisingly, there are problems reconciling the various published variants of this list. It is generally agreed that a total of 15 boats of two types were built. While there is general agreement as tothe number of the various different types launched, and broad agreement as to the current status of these boats generally, there are annoying issues with the identity of individual boats. Of course, this is the intent of Soviet and Russian warship designation systems. There is no rhyme or reason to pendant numbers, and unlike American hull numbers the Russian pendant numbers may be changed and re-assigned. Thus numbers B-405, B-425, B-468, and B-470 have been reported at various times, but do not appear to be currently assigned, as is the case with B-880, associated with the currently unreported name Del'fin. The assignment of hull numbers to contruction sequence for Project 877 boats without precise dates is entirely arbitrary and subject to revision.

The Nuclear Threat Initiative reports a total of 13 Varshavyanka/Kilo SSKs in active service, while warfare.ru reports 15 active and 4 reserve 877 / 636 Kylo class boats. The 2011 IISS Military Balance also reports 15 active and 4 reserve boats, but places this as 15 Paltus and 4 Varshavyanka boats. The Nuclear Threat Initiative reports B-401 NOVOSIBIRSK, B-800 KALUGA, B-459 Vladikavkaz as active, while warfare.ru reports them as inactive, and a good many boats reported active by warfare.ru are missing from the NTI list of active boats. NTI reports that B-248, the first Kilo, placed in commission in 1982, remains in service, but this seems implausible.