Ukraine's
Soviet-made Buk-M1 missile systems have been adapted to fire American
missiles, Ukrainian Air Force spokesman Yuriy Ihnat said in an interview with
Radio NV on Nov. 11.
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