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Spacecraft processing building, MIK KA, in Vostochny Clearly built for the future, the large spacecraft processing building at Vostochny spaceport was designed to prepare and check payloads before their integration with launch vehicles. The the facility was directly connected to a fueling station, where satellites could be loaded with hazardous propellants. 
Planned layout of the spacecraft processing building in Vostochny. The processing area for the Fregat stage is in the middle left; A super-clean room for spacecraft is on the right (foreground).
The spacecraft processing building in Vostochny has several specialized work sites for processing and handling various satellites, space tugs and entire rocket payload sections integrated under their fairings. The 8,640-square-meter facility was equipped with high level of climate control and filtration systems to ensure clean environment for sensitive sensors onboard the spacecraft at R8 level. A pair of 50-ton cranes built in St. Petersburg was mounted 34 meters above the floor and span 42 meters across the entire building. The original layout of the hall completed in 2016 included five work sites to service the spacecraft and Volga upper stage as well as Fregat. All of them would fly on top of the Soyuz-2 rocket. Specialized scaffolding, known as work sites, would enclose the spacecraft enabling engineers to access various systems onboard satellite during testing. Work sites were developed by KB Motor in Moscow. In February 2017, the TsENKI ground infrastructure division of Roskosmos announced that its teams had began the installation of equipment for the Fregat upper stage at the launch and processing facilities in Vostochny. The processing and checkout systems manufactured by NPO lavochkin were being installed at the command post, the Soyuz launch complex and the processing building. The work was scheduled to be completed before the end of April 2017. A separate clean-room facility with its own climate-control systems to provide P8 sterility level was also built inside MIK KA. The main assembly hall of the building is flanked by seven floors of 750 administrative and support rooms. The spacecraft processing building in Vostochny was equipped with its own Intranet with 22 routers and 945 outlets, connected by a total of 80 kilometers of wires, according to Roskosmos.
An internal view of the processing building for spacecraft in Vostochny in 2015, before installation of work place partitions. New work site for Soyuz replacement set up in Vostochny At the end of April 2026, Roskosmos' TsENKI infrastructure division published photos of the newly installed processing stand for servicing and preparation of the Return Vehicle, VA, which the main crew-carrying module of the new-generation PTK spacecraft. The processing rig was accommodated inside the Spacecraft Processing Building, MIK KA, in Vostochny, after the earlier plans to build a dedicated building for the crew vehicle had to be postponed. The VA work site became the second dedicated facility of the PTK processing and servicing complex (INSIDER CONTENT), after the vacuum chamber for air-leak tests which was being outfitted inside the next-door storage building (INSIDER CONTENT). According to TsENKI, the completed VA stand included lifting mechanisms, fueling lines, control systems, hardware for pressurized gases, fluids and power supply among other components.
The main work site (foreground) for autonomous servicing of the Return Vehicle, VA, of the PTK spacecraft aas seen around April 2026. 
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