Thande
Donor
Indeed. Slapping A and B together does NOT form C!
Huh, clearly you have no experience with rocket science
The Atlas V, America's current premier unmanned launcher.
Its second stage derived from earlier Atlas launchers. Its first stage engines? Russian. Taken from the Zenit.
The Zenit? Ukrainian. Nowadays used as a launcher on its own because the breakup of the Soviet Union meant the factory ended up in a separate country. But what was it intended for?
Strapon booster for Energiya, here used to launch the Soviet space shuttle Buran.
These days, when there's little money to research new technologies, rocket science is nothing but putting A and B together to make C.