The world's largest Mi-26 transport helicopters utilized by the Russian army can shortly be grounded. The arrest by SBU of Wiaczesław Boguslayev, erstwhile head of Motor Sich plant and the breakdown of its grid deprived Russia of the supply of D-136 engines. Their only maker is the Zaporozh plant, and a Russian substitute... can be produced in 2025 if a prototype can be completed. It has been under improvement since 2016.
