Cuba and North Korea use IL96/Tu-204 those are the original models not the modern versions. The model for Iran they expected to export far modern Tu-204CM. Iran never showed any interest.And about planes, even Russia today has several models (TU-214, SSJ-New, MS-21) that are more modern and more reliable than the old scrap fleet without replacement and safety criteria that Iran maintains and does not even make an effort to renew. But iranians prostrates himself to try for a contract with Boeing and Airbus, which increasingly despise Iran treated like trash.
The Venezuela President uses Cubana IL96 for international trips. before that Hugo Chavez used those Cubana planes. Cuba has pilots and crew trained on it.