PARIKRAMA
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Well, if you look at the air inlet design, you'll see a distinct similarity between Klub and Nirbhay.
...and these are only external similarities. But however, a similar design may just be a way of developing on proven concepts, so exactly what level of Nirbhay's tech is sourced from abroad is unknown, and we may never know for sure.
All we know is that we can use it without any restrictions.
Details...?
The other name is Kaliber/Caliber for 3M 14 Family missiles..
I am quoting from an article link is below
Kalibr is a new-generation SLCM, which is based on a Soviet long-range SLCM known as Granat, which, in turn, was a Soviet response to the American Tomhawk (TLAM-N). After the breakup of the Soviet Union, when Russian defense industry began to actively seek foreign markets, Novator design bureau, which produced Granat, created a new family of SLCMs. The first to be publicly unveiled was Kalibr 3M-14E, which could have been mistaken for a brand new missile because it was much smaller than Granat. The smaller size achieved two purposes: first, the new anti-ship missile had to fit into standard NATO torpedo tubes (which are shorter than the Soviet standard) and it had to have a range less than 300 km to remain under the MTCR-mandated limit (Granat had the range of 3,000 km). Reportedly, in 2006 3M-14E Kalibr missiles were sold to India.
Novator did not stop there and eventually created a whole family of cruise missiles: in addition to 3M-14E, it also advertises 3M-54E and 3M-54E-1. These three missiles are part of systems known as Klub-S (for submarines), Klub-N (for ships), and Klub-M (land-based anti-ship missiles for coastal defense); Novator also offers a Club-A system for aircraft. All these missiles have the declared range below 300 km, which is natural for weapons intended for export. Designation “E” traditionally denotes the export version of weapons systems.
Part of the Kalibr family, however, is intended solely for “domestic consumption” (known as 3M14, 3M54, and 3M541) and their ranges are many times greater (some sources use the “E” designation for missiles not intended for export, which is an obvious mistake). Depending on the source, their range is either 2,600 km or 1,500 km; some hypothesize that the longer range is associated with missiles equipped with nuclear warheads while conventionally armed Kalibr SLCMs have the 1,500 or somewhat greater range.
All these missiles are subsonic with one important exception: the last stage of the three-stage 3M54 can accelerate to three times the speed of sound 20-40 km before the target(3M541 is a shorter, two-stage subsonic missile that has a more powerful warhead). Acceleration helps penetrate ship defenses and builds inertia to penetrate the body of the target ship. Although all these cruise missiles were initially developed as anti-ship (including basing on submarines, surface ships, and on shore for coastal defense), they have recently also been given capability against targets on land.
Kalibr missiles are designated as high-precision and can travel a complex trajectory with up to 15 turns along the path. For example, if the target ship is on the other side of an island, the missile(s) will fly around that island to reach it.
Kalibr missiles are reported to have dual (nuclear and conventional) capability.
Russia's Cruise Missiles Have Changed Strategic Military Balance
