https://www.pcgamer.com/rainbow-six-siege-outbreak-gets-another-cinematic-trailer-starring-ash/

Rainbow Six Siege is getting an alien-shooting four-player cooperative mode. If you'd told me that two years ago, I wouldn't have believed you. While it's among my favourite shooters, RS:6 isn't a funny or lighthearted game. It's very serious. 

But it's happening, and while we won't get the full reveal until the Siege Invitational this February 18, Ubisoft has rolled out a second trailer. Embedded above, it features ye olde operator Ash calling Russians (who are, obviously, usually the baddies) to help with a rather pressing matter. I would hazzard a guess that the pressing matter is aliens, and the requirement to shoot them.