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During the first quarter of 2009, Roskosmos, [Russia's Federal Space Agency], had finalized its requirements for the next-generation manned spacecraft…
The goal of the project was to develop a new-generation spacecraft to replace [the] venerable Soyuz.
A defining feature of Russia's new-generation PPTS* spacecraft would be its landing system [1]… [d]ue to the political requirement to land future manned missions [o]n Russian soil…
[Additionally, [t]he reentry capsule could only employ environmentally safe propellants during the atmospheric phase of the flight.
*(PPTS is the Russian abbreviation of "Perspektivnaya Pilotiruemaya Transportnaya Sistema" or
"Prospective Piloted Transport System.")
