Following the adaptation of the American HARM anti-radar missile to Ukrainian aircraft of Soviet origin, Ukrainian and American engineers have found a way to adapt American RIM-7 Sea Sparrow short-range anti-aircraft missiles to Ukrainian Buk anti-aircraft systems, also of Soviet origin. This delivery will ensure a flow of missiles to Ukrainian systems that have been adapted to fire this missile.
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Specifically the RIM-7:
https://www.aircosmosinternational.com/article/american-missiles-for-ukrainian-soviet-era-anti-aircraft-systems-3461