Russia's Secret MiG-41 Stealth Fighter: Super Weapon or a Lie? The goal of the PAK DP program is to develop a replacement for the MiG-31, which entered service with the Soviet Air Force in 1980, and later was upgraded as the MiG-31BM. In the technology world, the term "vaporware" refers to a product that is not yet available and remains largely in the concept stage – it also often is something that fails to materialize and never makes it to market. Russia's fifth-generation plus or even sixth generation Mikoyan MiG-41 stealth interceptor, which is being developed under the PAK DP program, ...