ll these initial test flights were expected to originate in Baikonur. It is logical to assume that the switch of the PTK NP spacecraft to the Angara-5-derived launch vehicle based in Vostochny would require additional unmanned launches into low Earth orbit. Finally, with the appearance of a heavy-lifting launch vehicle, two unmanned versions of the PTK NP spacecraft were expected to fly test missions into lunar orbit, paving the way to a manned circumlunar flight by 2030. (642) At the time, Russian space officials predicted the first launch of the Yenisei-5 heavy-lifting launch vehicle from Vostochny Cosmodrome around 2028.