Vostochny 'not ready' for December Soyuz liftoff, says source in Roscosmos.
Orthodox blessing for Soyuz-2 rocket ahead of historic unmanned mission.
Blast-off was 'successful' but first planned communication session 'failed' and craft did not reach 'target orbit'.
Vostochny's debut blastoff will be next year, hopefully spring, a delay of at least four months.
Roscosmos allows access to ultra-modern technology at complex that will send Russians to the Moon... and beyond.
Assembly of Soyuz-2.1a rocket has begun at new cosmodrome as country prepares for new space era.
Inside the new Vostochny Cosmodrome in the Far East of Russia - exclusive pictures.
Details of ambitious Space programme show first Russians will land in 2029 with new Angara rocket taking crew into orbit.
Target for cosmonauts to fly from Vostochny spaceport in 2018 is scrapped.
Kremlin gives go ahead for work on the new rockets for missions from Vostochny space centre.