LookingGlass
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It's just an RVV-AE / K-77 without stabilizers installed. No internal equivalent was ever accepted in service for RuAF. It's rough equivalent is AIM-120B and it has been offered for export since 2000s.It's a 170-1 w/o engine and wings.
RVV-AE / K-77, MAKS-2007 (note the form of the base for lattice rudder and fairings for laser proximity fuse)
К-77 / Р-77 - AA-12 ADDER | MilitaryRussia.Ru — отечественная военная техника (после 1945г.)
Сборник справочной информации по отечественным системам вооружений выпуска после 1945 г., форум
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Air-to-air missile RVV-AE | Catalog Rosoboronexport
The RVV-AE medium-range air-to-air missile is designed to engage air targets (fighters, attack aircraft, bombers, helicopters, military transport aircraft and cruise missiles) from any direction, day ...
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RVV-SD / K-77-1 / R-77-1 (in RuAF service) for reference
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Air-to-air missile RVV-SD | Catalog Rosoboronexport
The RVV-SD medium-range air-to-air missile is designed to engage air targets (fighters, attack aircraft, bombers, helicopters, military transport aircraft and cruise missiles) from any direction, day ...
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English markings serve as an additional confirmation of an export model. There was no other "secret" medium range AA missile in serial production in 2018-19 other than these.