MOSCOW—Russia’s deteriorated relations with the West following Moscow’s annexation of Crimea in 2014 has had substantial consequences for the MC-21 program.  The hardest blow came at the end of 2018 when Irkut’s key suppliers of composite parts—Ulyanovsk-based AeroComposit and Obinsk Research and Production Enterprise (ORPE) Technologia—were slapped by U.S. sanctions and lost access to foreign fiber and prepregs. Russian officials admit that the ...


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