Cancelled Soviet era military aviation projects

I would have to say the T-4MS... swing wing supersonic bomber than never was...

Is often shown these days as what the PAK DA might look like but the design was rejected as impractical before the Tu-160 design was chosen.

Photograph of an older image of Raduga's Kh-90 GELA - experimental hypersonic aerial vehicle on display.

An-14SH  

It seems the chaps at @AntonovCompany have been raiding their archives and found images of this odd An-14 derivative, An-14SH which was trialled with air-cushion landing gear, flew for the first time today in 1983.

Caspian Sea Monster abandoned at sea in Dagestan