Naval version Strogiy. Work on a naval version
M-1 Volna (SA-N-1) started in 1956, along with work on a land version. It was first mounted on a rebuilt
Kotlin class destroyer (Project 56K)
Bravyi and tested in 1962. In the same year, the system was accepted. The basic missile was a V-600 (or 4K90) (range: from 4 to 15 km, altitude: from 0.1 to 10 km). Fire control and guidance is carried out by 4R90 Yatagan radar, with five
parabolic antennas on a common head. Only one target can be engaged at a time (or two, for ships fitted with two Volna systems). In case of emergency, Volna could be also used against naval targets, due to short response time. The first launcher type was the two-missile ZIF-101, with a magazine for 16 missiles. In 1963 an improved two-missile launcher, ZIF-102, with a magazine for 32 missiles, was introduced to new ship classes. In 1967 Volna systems were upgraded to
Volna-M (SA-N-1B) with V-601 (4K91) missiles (range: 4–22 km, altitude: 0.1–14 km). In 1974 - 1976 some systems were modernized to
Volna-P standard, with an additional TV target tracking channel and better resistance to jamming. Later, improved
V-601M missiles were introduced, with lower minimal attack altitude against aerial targets (system
Volna-N). The
Rajput-class destroyers, which were modified
Kashin-class destroyers built for India, also carried the M-1 Volna system. By early 2025, the three ships of the class still in service had the system replaced by other weapons or removed, ending the system's service in the Indian Navy.
Modern upgrades Since Russia replaced all of its S-125 sites with
S-300 systems, they decided to upgrade the S-125 systems being removed from service to make them more attractive to export customers. • Released in 2000, the
Pechora-2 version features better range, multiple target engagement ability and a higher
probability of kill (PK). The launcher is moved onto a truck allowing much shorter relocation times. • It is also possible to fire the
Pechora-2M system against
cruise missiles. Deployment time 25 minutes, protected from the active interference, and anti-radiation missiles (total in practical shooting) Early warning radar is replaced by anti-stealth radar
Kasta 2E2, target distance at 2.5–32 km, target altitude - 0.02–20 km, missile launchers can be positioned at up to 10 kilometers away from the control center. Speed up to 1000 m/s (target), Used rocket 5V27DE, by weight the warhead + 50% range of flight splinters + 350%. Probability of hitting the target 1st rocket: at a distance up to 25 km - 0,72-0,99, detection range with the radar cross section = 2 sq meters about 100 km, with RCS = 0.15 sq m - about 50 km, with no interference. When using active jamming - 40 km. ADMS "Pechora-2M" has the ability to interfacing with higher level command post and radar remote using telecode channels. Is equally effective at any time during the day and at night (optical location, daytime and nighttime, and also thermal imager) was awarded a contract to overhaul Egypt's S-125 SAM system. These refurbished weapons have been reintroduced as the S-125 Pechora 2M. In 2001, Poland began offering an upgrade to the S-125 known as the
Newa SC. This replaced many
analogue components with
digital ones for improved reliability and accuracy. This upgrade also involves mounting the missile launcher on a
WZT-1 tank chassis (a
TEL), greatly improving mobility and also adds
IFF capability and data links. Radar is mounted on an 8-wheeled heavy truck chassis (formerly used for
Scud launchers).
Serbian modifications include terminal/camera homing from radar base. Cuba also developed a similar upgrade to the Polish one, which was displayed in
La Habana in 2006. Later the same year, the Russian version was upgraded again to the
Pechora-M which upgraded almost all aspects of the system - the rocket motor, radar, guidance,
warhead,
fuse and electronics. There is an added
laser/
infra-red tracking device to allow launching of missiles without the use of the radar. There is also a version of the S-125 available from Russia with the warhead replaced with
telemetry instrumentation, for use as target drones. In October 2010, Ukrainian
Aerotechnica announced a modernized version of S-125 named
S-125-2D Pechora. As of 2018 according to the UkrOboronProm, the S-125 surface-to-air missile underwent an integrated modification of all elements, including modernization of missiles, as well as the use of a new radar station built on solid-state elements. The distance of the Ukrainian S-125 modernization's engagement area, 40 km, is greater than that of the Russian one. . The Vietnamese state-owned agency
Viettel Aerospace Institute has unveiled a modernization version of S-125, designated as the
S-125-VT. More than 5 systems has been upgraded and being in service of
Vietnamese Air Defence since 2024. The upgrade package includes compatibility with a newer, more modern surveillance radar, enhanced anti-jamming capability, and mechanization of components such as the SNR-125 fire-control radar and the missile reloading vehicle. A new missile model was also developed and upgraded, designated TLDK-35. ==Operators==