But countries are more than land. It's not that Ukrainian land was part of USSR - the Ukrainian nation was part of USSR. Same with Russian nation.
>The program is a Russian effort and the result was a Russian rocket.
No, that's the point: the program was Soviet, and the result was a Soviet rocket. Russia was just one part of that. And if you look at the last two decades, you'll see what while Ukraine was able to build a functioning country, Russia failed to achieve anything apart from selling out what's left by USSR and oil/gas extraction using foreign-bought technologies.