[1] By 1951 - 1953 the Korolev bureau had prepared an experimental design, incorporating a prototype astronavigation system.
Additionally, Korolev's chief priority was the development of the R-7 ICBM.
In 1954 a government decree authorised the Lavochkin and Myasishchev aircraft design bureaus to proceed in parallel with full-scale development of trisonic intercontinental cruise missiles.
[citation needed] The EKR as designed by Korolev would have been a Mach 3 ramjet, accelerated to supersonic cruise speed by an R-11 rocket booster.
Smaller than the missile proposed by the Germans, it would have had a range of 730 km with a flight time of 927 seconds, a lift to drag ratio of 2.51, and a wing area of 3.31 m².