Universal Rocket Module (URM) is the name of the modular liquid fuelled first and second stage of the Angara expendable launch system.
[1] URM-1 is a unitary structure 2.9 meters in diameter and 25 meters in length that includes an oxidizer tank, a fuel tank (both tanks being coupled by a spacer) and an RD-191 engine burning RP-1 fuel with liquid oxygen producing a thrust of 1.92 MN.
[2] URM-1 was first flown in 2014 on the Angara 1.2PP suborbital test flight.
It is powered by a single RD-0124A producing 294 kilonewtons, derived from Block I's RD-0124.
[3] The Naro-1 launch vehicle was based on the URM-1 with a reduced thrust RD-191, called RD-151, combined with a solid-fueled second stage built by Republic of Korea KARI.