[throwawaymobule]

Has any country exported an RTG to be shot into space by someone else?

Vertically-integrating it yourself is one thing, but I'd expect NASA exporting a chunk of plutonium to India, even if they're both are nuclear states, would be challenging.

[sidewndr46]

the US supplies nuclear weapons to partner countries and keeps them in US custody and guard while on foreign soil. I suspect the same kind of agreement would be in place with an RTG until launched.