Buran-class orbiters

first and only operational spaceplane in the Soviet Buran programme

2K (GRAU index serial number 11F35 2K, NPO Molniya airframe number 1.02), often referred to as Ptichka (, "little bird", although this was also a nickname for all orbiters in the programme), is the second Buran-class orbiter, produced as part of the Soviet/Russian Buran programme. Although 2K was the closest to being completed of any of the Buran-class orbiters (after the orbiter Buran), it was never finished. The program was officially cancelled in 1993, at which point the shuttle was 95-97% complete. The proposed official name for 2K was Burya (, "storm" or "tempest").

unfinished fourth spaceplane in the Soviet Buran programme

unfinished third spaceplane in the Soviet Buran programme

unfinished fifth spaceplane in the Soviet Buran programme