As Leg has said the problem with the Bear's Den scenario is that it rather stands alone and is therefore problematic to integrate into a campaign with other pre-written modules. I think that the Ukraine is a potentially very interesting location for a T2k campaign however and so rather than running the Bear's Den scenario as intended I've used it as a starting point for a campaign that will eventually result in the characters leaving the Ukraine (they've been promised a place on a sub so I'll let you guess where that's heading eventually in terms of modules!
).
In the meantime they've already been involved in the Ukrainian civil war (one thing I've added) and are currently planning on how to destroy the Red Bear's SCUD as well as trashing (and possibly stealing) his air assets (another thing I've added).