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Russian #BVR doctrine of 2-Salvo launch is very well known inherited from Soviet era. #Flanker will carry active radar & heat/passive guided BVRAAMs. Once target is in #DLZ active radar missile like R-27EA/R-77 will be launched followed by IR homing R-27ET/R-27EP (Passive RF) 1/3 
Idea is that active seeker will force target to do evasive manoeuvres & employ ECMs fully exposing heat/electronic signatures making job much easier for few seconds delay launch of IR/Passive RF missiles like R-27ET/R-27EP having same kinetic performance as R-77/R-27EA/ER 2/3
This very doctrine forced China to develop its own active radar BVR missile that could rival AIM-120B/C. Russian failure to complete full development of R-77 due to funds left them well behind hence they kept Soviet era doctrine of 2-Salvo launch with older R-27 Almo family 3/3
