My unnecessary advices:
WP units benefits immensely from reverse slope, close range defense, and i see there is precisely this kind of terrain in Westerbruck. I'd try to form two defensive lines there, and keep reserves deeper downtown. This means leaving the outskirts to NATO, but gives you the best shot at destroying a lot of enemy units if they try to take the VPs. You can also hide a strike group in the western forest, ready to flank the enemy.
In the attached drawing, i've divided my forces in Red, Blue and White.
- Red is the strongest one. Let's say 3 BMP Coy and a T-80 Coy. in reverse slope position, and reserves deeper in the city. The reserves could, if needed, contest an eventual enemy push through the eastern bridges.
- White is the flanking force. 2 BMP Coy and a T-80 Coy. They will head for the western hills immediately, and place themselves out of sight. If they manage to not get spotted, and the enemy sends all their troops against Red, they will wait and time their attack to maximize damage. If a BMP coy is able to avoid the enemy altogather and go hunting SPAs and the HQ, even better. Taking out enemy artillery would be awesome.
- Blue is the weakest one. 2 BMP Coy should suffice. Their order is to guard the northern route; if the enemy doesn't show up, they are free to support White or Red.
The armored battalion coming from the east will have it rough: if the enemy occupies the eastern plains, it will be very hard to cross the open ground to help the city defenders... The eastern recon elements must survive until their arrival, because if you lose your "eyes" there you risk sending your tanks straight into the enemy sights.