Death to Saboteurs.
Learn from Mexicans- Start building tunnels (from nearby NATA countries) into the Ukraine that can haul supplies to the natives. At night, use stealth trucks to move the supplies inland. Worry about not only ammo and equipment, but medical supplies too, like bullet hole sponges, gauze, antibiotics, radiation pills, etc. This may be the first war where Neutron bombs are used. These are very expensive to make, but their short half-lives do not leave a nuclear wasteland. If there is a mutant savior from Chernobyl, release him now to lead the resistance. Above all, pray. Let the Romanians supply the curse power.