According to the documentation posted on the state procurement website, three Tu-214 aircraft with serial numbers 44811031 (serial number 531), 44912032 (serial number 532) and 44912033 (serial number 533) are being built for the Special Flight Team (SOS) "Russia" of the Presidential Administration of the Russian Federation at the Kazan Aviation Plant (the branch of PJSC "Tupolev"). This follows from the cited contract of PJSC "Tupolev" with FSUE GosNII GA (Research Institute "Aeronavigatsii") for participation of the latter in "escorting a complex of certification works for three Tu-214 aircraft for the" Russia".

https://bmpd.livejournal.com/3149451.html

https://bmpd.livejournal.com/3149451.html