Zond programme

The Zond program was an encompassing term for a set of three different robotic spacecraft produced by Sovekos.

3MV

 * Zond 1 (April 1964) [OTL]
 * Zond 2 (November 1964) [OTL]
 * Zond 3 (July 1965) [OTL]

Soyuz 7K-L1

 * Zond 4 (March 1968) [OTL, and prior are OTL as well]
 * Zond 5 (September 1968) [OTL]
 * Zond 6 (November 1968) [OTL]
 * Zond 7 (June 1969) [OTL, skip re-entry too]

Block R RTB (N1-L3M)

 * Zond 8 (March 1970) - Unmanned Block R RTB braking stage launched on a translunar trajectory, to dock with Soyuz-Luna 5.
 * Zond 9 (May 1970) - Unmanned Block R RTB braking stage launched on a translunar trajectory, to dock with Soyuz-Luna 6.