JF Mezei writes:

On 2018-09-07 00:07, Greg (Strider) Moore wrote:

[...]

Of course Mercury had one. Vostok had one.
Gemini had ejection seats; which failed in one test. Well the seats
apparently worked, but the hatches didn't properly eject.


If Vostok had one, you'd think it would have been adapted/reused for
Vokshod.

There was no space for three crew and three ejection seats, There was
no room for three crew in space suits. Even with the more capable
launcher (a precursor of the Soyuz launcher), there probably enough
margin to orbit that mass even if it could fit.