Croatian MiG-21s refurbished by Ukraine have engines with questionable sources

An Croatian investigation into the refurbishment of its MiG-21 fleet by Ukraine has uncovered more irregularities. Paperwork from Ukraine indicated that two engines that it supplied to Croatia were of unknown origins.

MiG-21UMD "Mongol" of Croatian AF
By Jerry Gunner (Flickr: MiG-21UMD “Mongol” of Croatian AF) [CC BY 2.0], via Wikimedia Commons

So far, it has been determined that five of the MiG-21s that Croatia bought as part of the refurbishing package had been put together using parts from airplanes that were scrapped by other air forces.

The hulls were from Bulgaria, which retired the jets back in 1998, and the wings were from Algerian MiGs.