Cold war prototypes that didn't make it

Inspired by some great pictures from “Century Fighters” thread, I decided to make this post and cover designs from same era from all over.
Technology, pushed by cold war fear and enormous amounts of money invested in new projects, made this period most interesting specially in aviation.

I’ll start with couple of Soviet prototypes that never made it to production.
These are pretty rare so if you have more shots of the same please post too.
Mikoyan Ye-8
Sukhoi P–1