Best engine currently flying: Musk praises Russian rocket

Elon Musk took to Twitter to praise Russian rocket after the Crew Dragon test flight to ISS and said, "Russia has excellent rocket engineering and best engine currently flying." He had embedded an article which criticised Russian space agency Roscosmos over congratulating NASA and not Musk's SpaceX. "Reusable version of their new Angara rocket would be great," Musk added.