Is there a way the Russian player not receive defense bonus during a heavy artillery attack?
Did you download boboset's Quick Reference Chart ?
A nice chart
1.If the Russians have a 'Fire Marker' on the area, they loose TM. [Units being 'fresh' or 'Flipped' could be affected ]
2.If the Russian controls the area but the Germ has unit(s)
there and he uses his Pioneer card to negate the TM.
I use the Pioneer card when Russians are fired on by a unit(s) outside their area, or when attacking with Air power or Artillery cards to negate their TM.
[Otherwise I could not find a use for the Pioneer card, other than negate a Rubble card]
That's my guesses or reason'ings
Maybe a expert or Nick will weigh in.