Check the email address. Yahoo.fr means he is French, not Rowandan. This is a typical scam. They use pens and pencils as bait.. once the have a nibble they move on to identity theft and fraud.
Rwanda's a former Belgian colony in central Africa; one suspects that after independence, and since one of their official languages is French, that they kept some commercial connections if not with the mother country, at least the major French-speaking country.
It's a scam, but I can't figure out why the primitives haven't fallen for it.
After all, they did four years ago, for an even flimsier scam.