LDM
This video shows the teardown of two Russian sensors. The first sensor is not a part of an Iskander missile but of a X-101 missile.
00:00 - Intro
00:25 - Optical sensor from X-101 missile
02:30 - 3-axis Fiber Optic Gyroscope (probably from Tornado MLRS)
Links
A picture of the first sensor with the optics:
https://photo.unian.info/photo/117351...
Several viewers have found the technical documentation of the Fiber Optic Gyro:
http://www.optolink.ru/documents/trs-...
Other information concerning the FOG:
https://en.defence-ua.com/industries/...
Technical documentation in russian:
https://ela.kpi.ua/bitstream/12345678...