That's because Russia no longer needs them (hasn't received drones from them in a while) and upgraded to having USA as an ally, and probably Israel. Russia is about to be very rich, seeing how they've now one of big oil suppliers on the global market.

China is selling shit loads to Russia, too. In fact, this just enables them to justify their imperial ambitions over Taiwan and more.

Edit: These downvoted are curious. China bots?