This was primarily due to the emergence of sea-based nuclear missiles, which turned submarines into strategic weapons.

The appearance of nuclear power plants on submarines has greatly increased their autonomy, cruising range, underwater speed and, as a consequence, the severity of the threat they create.

In addition, starting from a cold state took 5–10 minutes for the GTU compared to the several hours required for the STU.

For the first time in Soviet shipbuilding, it was equipped with two anti-aircraft missile systems (M-1 "Volna").

Each complex consisted of a two-boom launcher ZIF-101, a Yatagan control system and a magazine with two rotating drums for 8 V-600 missiles each.