[250x]One of the top secret Russian factories Sokol (Falcon) there is a modernization process of Russian MiG-31s going on. Its almost impossible to get inside, however this photographer was allowed for a few minutes in to take the photos. Here & Read more...

http://englishrussia.com/2017/08/29/modernizing-mig-31-jets-at-top-secret-falcon-factory/