The project involved around 130 suppliers from Russia, India, Britain, Germany, Denmark, Belarus, Ukraine and other countries including over 30 St. Petersburg-based naval design organizations and institutes.

In July 2012, India Today reported the start of talks about purchasing three additional Talwar-class frigates (No.7 to No.9).

[24] On 11 March 2024, reports emerged that INS Tushil, being built by Yantar Shipyard has started sea trials.

The ship will later be commissioned by Indian Defence Minister Rajnath Singh in early December 2024 during a formal visit to Russia.

The two frigates will be armed with BrahMos missile system and will include a host of Indian equipment and will be delivered by 2027.

The new class of ship will feature BHEL-manufactured OTO Melara 76 mm gun instead of its Russian counterpart, along with other Indian weapon and sensors.

[32] In September 2021, India ordered two sets of modified M7N2E units for Batch-4 frigates at the coast of $100 million which has upgrades like microprocessor control system and a power output of 58,000 hp (43,000 kW), higher than previous subclasses.

While the superstructure sides are sloped and relatively clean, the very cluttered topside of the ship cannot be remotely described as having any signature reducing features.

The four gas turbines are mounted on isolated cradles which minimize their contact with the hull and thereby considerably reduce the transmission of her vibration and sound.

The 3M-54E Klub is an 8.22 metres (27.0 ft) long missile using active radar guidance with a range of 220 kilometres (140 mi).

It is a three-stage missile in which the terminal stage reaches supersonic velocity (Mach 2.9) when it is approximately 20 km (12 mi) from its target.

[36] The later batches of 7 ships (Teg onwards) are fitted with the BrahMos supersonic cruise missile, which has a range of 300 kilometres (190 mi) and moves with the velocity of Mach 3 throughout its flight.

Guidance and target illumination for these missiles is provided by four MR-90 Orekh (NATO: Front Dome) radars, which are connected to a command and control post.

The SA-N-12 missile uses a combination of inertial guidance and semi-active radar homing to its maximum range of 32 km (20 mi).

However, the configuration of Shtil-1 missiles were changed into vertical launching system (VLS) with an enhanced range of 50 km (31 mi) for Batch-3 and Batch-4 frigates.

Each system consists of two GSh-30k (AO-18K) six-barreled 30 mm Gatling guns, fed by a link-less mechanism, and two SA-N-11 (navalised variant of the 9M311, SA-19) SAM clusters.

[41] The gun features higher automation of fire preparation and control and employs advanced guided and rocket-assisted long-range and enhanced-lethality projectiles fitted with dual-mode impact/proximity fuzes.

In addition, the gun turret features stealth technology to minimize the radar signature of a ship.

The APSOH sonar performs active ranging, passive listening, auto tracking of targets and classification.

The HUMSA is a panoramic medium-range active/passive sonar system developed by the Naval Physical and Oceanographic Laboratory (NPOL).

[6] Information released from the Severnoye Design Bureau (SDB) indicate that French towed array sonars (TAS) are also fitted.

This is very plausible given that many Indian Navy ships now use French TAS, however INS Talwar shows no signs of such a system.