Angara A5 (Russian: Ангара-А5), is a Russian expendable heavy lift launch vehicle which consists of one URM-1 core and four URM-1 boosters, a 3.6-metre (12 ft) URM-2 second stage, and an upper stage, either the Briz-M, Blok DM-03 or the KVTK.
[2] In the Angara A5, the four URM-1s used as boosters operate at full thrust for approximately 214 seconds, then separate.
The URM-1 forming the vehicle's core is operated at full thrust for lift off, then throttled down to 30% to conserve propellant.
The core is throttled back up after the boosters have separated and continues burning for another 110 seconds.
The second test flight was launched on 14 December 2020 from Plesetsk.