The Mil V-12 (NATO reporting name Homer) is the largest helicopter ever built and this example is the second prototype and last built of the type (sometimes incorrectly quoted as c/n 002). In 1975 it went on display at Monino without any registration (actual operational registration is unknown). In 2012 it was falsely painted as seen here, with the registration of the first prototype (which was still preserved at the MVZ im. Milya factory at Tomilino by 2018).
Both prototype V-12s outperformed their design specifications and set numerous world records which still stand today, Despite these achievements the Soviet Air Force refused to accept the helicopter and all development on the V-12 was stopped in 1974.
This photo was added on 12 March 2018, and has since been viewed 132 times.