Polish
I have have this happen against me so I thought I would introduce ComadrejaKorp to it as I did my strat bombing in France...
The Mech moves into Germany and takes Bratislavia. This is a pain as it is a loss 5PP for at least 2 turns.
The Poles pull back to their capital in an attempt at delaying.
Some players attack everywhere they can. That is an option but in looking at the map I think there is a chance that ComdrejaKorp may not enough against Warsaw to take it next turn.
I could surely be wrong and perhaps it was best to attack and try to damage units but losses would be minimal
The Poles also bomb the one Panzer in range to reduce its efficiency, starting with the fighter to drain the LW defense so that the bomber hits unabated.
A few units are put into garrison mode to see if the PP can be converted to some reinforcements before the attack.
All PP goes into reinforcements. Not sure if there is anything else you can do with them.
