If you're concerned you might be overdoing the damage 30-35 km from Warsaw, there's an easy solution.
Many, many tactical nukes were used during the war in many many places. Just because Warsaw received three warheads in 1997 doesn't mean the countryside within 50km wasn't pockmarked with small nukes over the preceeding and subsequent months, or even years.
Just take a look at the encounter tables and you'll note that "crater" can be found almost anywhere that's not currently being fought over or has a large military unit camped nearby.
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