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When we look at the designs that came out of Soviet aircraft companies post 1945 and in inventory of VVS there is a notable absence of piston engined COIN/CAS aircraft

Assume the Soviets kept some ww2 era planes in service till late 60s in that role , which aircraft would be best suited?
Pe-2 ? And or IL-2/10 ?
WHAT kind of modifications they would need to carry heavier warloads and keep them viable till 60s?
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