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And more specifically having a load out of 2 x R-73M2s gives powerful close combat capabilities, while 2 x R-77s give a bit of reach while having a good fire and forget performance, and a couple of R-27ET missiles would allow long range engagement of stealthy targets or low altitude run down shots.
Normally SARH requires a lock and tracking of the target and targets are easier to lock when they are closing targets. The effective range for a lock on a closing target could be 30-40 percent greater than the range for a receding target. This can mean a small fast target like a cruise missile flying very low can be a difficult target because the low altitude reduces AAM performance and the fact that it is receding reduces the range that a SARH missile can achieve a lock.
In comparison a receding target is easier to lock on with a heat seeking missile as the engine exhaust and other hot parts are clearly visible so you could get locks at much longer ranges than you could with a head on engagement.
this all means that a closing target can be hit effectively and efficiently with the R-73 for close range targets and R-77 for targets further away while escaping targets can be engaged with the R-27ET with a good chance of success. The different weapons are complimentary.
“The West won the world not by the superiority of its ideas or values or religion […] but rather by its superiority in applying organized violence. Westerners often forget this fact; non-Westerners never do.”
― Samuel P. Huntington, The Clash of Civilizations and the Remaking of World Order