It seems you aren't aware of the investigation undertaken by Bellingcat and later corroborated by the official commission. They traced all the way Buk came from Kursk (Russia) and back there and even enumerated the staff of Russian regular army servicemen that operated Buk.
https://www.om.nl/onderwerpen/mh17-v...ntation-joint/
http://www.whathappenedtoflightmh17....wning-of-mh17/
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