Kosmos 186 and Kosmos 188

Kosmos 186 (Russian: Космос-186 meaning Cosmos 186) and Kosmos 188 (Russian: Космос-188 meaning Cosmos 188) were two uncrewed Soviet Union spacecraft that incorporated a Soyuz programme descent module for landing scientific instruments and test objects. == Mission == Because of the lethal outcome of both the Soyuz 1 and the Apollo 1 missions earlier that year it was decided to proceed with unmanned flights first.

Source: Wikipedia — Kosmos 186 and Kosmos 188 (CC BY-SA 4.0)