HIMARS on Russian Radar - how does it get through?

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NOTE: I realize that the detection range of the SU-25 was too far away, but I took some creative license with the video because the track looked best in that location.

HIMARS stands for High Mobility Artillery Rocket Launcher System. It is used by the Army and U.S. Marine Corps for long-range precision fires. 4 of these systems were donated to Ukraine with more on the way.

HIMARS rockets seem to be getting though Russian air defenses where they are striking logistics and command and control centers deep behind enemy lines. But how are these missiles getting past the traditionally good Russian air defenses.

I believe that Russia has never encountered a RAM or Rocket Artillery and Mortar threat before. They are used to ABT (Air Breathing Threats) such as Aircraft and TBM (Tactical Ballistic Missile) threats, but have not learned how to deal with RAM.

So the missiles are probably showing up on radar, but since HIMARS rockets don't fit the profile of an aircraft or a ballistic missile, the system doesn't know what to do with them until it is too late.

Russia may be negate this by a software update or by training.

References:
https://missilethreat.csis.org/system_tax/russian-air-defense/#:~:text=During%20the%20Cold%20War%2C%20the,of%20nations%20around%20the%20world.

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