The Tsybin aircraft here was intended as a supersonic ( mach 3 really ) aircraft. Of interest is that the engines were podded on the wing tips ( or very near the tips ) as in a few other concept planes of the period such as :
Avro 730
French Trident
German VTOL aircraft VJ 101
and to a lesser degree a Bristol 188
While installation of the engines on the wing tips is relatively simple, I am sure that there are other complications, most noteably is the one engine out especially on take off.
More info on the aircraft:
https://en.wikipedia.org/wiki/Tsybin_RSR
https://www.youtube.com/watch?v=xvy5jAfC10s
Anyhow, all fun stuff
Isaac