I would just steal major themes from video games and movies.
One character can be tracking down a sibling/significant other who has taken as a hostage. Another can on the hunt for intel about a certain break-away faction. Maybe one already has intel about an impending attack on a key city, and is trying to stop it.
It would also be pretty interesting if you decide to have your CIA (for this example) agent with his own agenda, and an undercover KGB agent (with their own agenda) end up in the same group.
Another idea would be an 'unofficial undercover'. A civilian from the Kalisz area who is passing themselves off as something else (a German tanker, a Czech MP, etc.). They could be acting for some kind of resistance or defense group, trying to get the PCs to free the region into of flee it.
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