2K (GRAU index serial number 11F35 2K, NPO Molniya airframe number 1.02), often referred to as Ptichka (Russian: Птичка, "little bird", although this was also a nickname for all orbiters in the programme[2]), is the second Buran-class orbiter, produced as part of the Soviet/Russian Buran programme.

[4] The mission profile included: In August 1995, 2K was moved into storage within the MZK building (Russian: МЗК, Монтажно-Заправочный Комплекс, "Assembling and Fueling Facility") at Baikonur Cosmodrome, alongside the full size test article OK-MT.

The contractor for the Buran space programme, RSC Energia, had set up a subsidiary CJSC Energia to manage its overseas assets in 2004, which were then transferred to RSE Infrakos in 2004 and relinquished to JSC KRISP Aelita, a joint Russian-Kazakh company.

[1][6] With the Buran destroyed in 2002, 2K is considered valuable as the last of its kind, and Musa has offered to trade the spacecraft in return for the skull of last Kazakh khan Kenesary Kasymov.

[7] In April 2021, 2K was vandalized with graffiti, including the word dobro (Russian: добро, meaning "good") on the right side of the orbiter.