Ka'ereth

Apologies, because this is slightly off-topic, but how many Russian missions are there? I've completed this one a while ago, but my researchers said there was another base somewhere close and I'd need to get more files. That was ages ago, and I can't research anything else, the biomass is spreading pretty quickly and I've got a sneaky feeling my game file has gone crazy and invented a mission that doesn't exist, and now it's holding out on me! I need the Project Dreamland Files, which I thought I was collecting from the Russian Base, but either there's another mission which isn't appearing, or my soldiers threw the files out of the chopper on the way back to the base (in which case I'm going to make them eat incendiary rockets) Or do I just need to keep playing and waiting?