Had a TCAS RA with an AF aircraft climbing through our level over deepest Africa in the middle of the night. They werent on 126.9 and were communicating in French to ATC. They didnt respond to their RA causing a strengthen RA for us. When asked why, the reason was "they could see us". This was post Uberlingen.
If they could see us, why on earth continue climbing through an occupied level?