Aren't those engines Russian by the way?!
No, the SLS's engines are all US-developed and -built. The boosters are 5-segment versions of the shuttle's 4-segment solid rocket engines. The core uses four RS-25 engines, which was a US-developed hydrogen/oxygen rocket used on the shuttle. This SLS flight used an "interim upper stage" with RL-10 engines, a venerable US hydrogen/oxygen rocket.
Basically, the SLS repackages a lot of shuttle hardware and technology.
Biting the hand that feeds IT
