The first CD version included "ultimate risk" (which i played endlessly in every scenario) included an "abandon territory" option whereby you could make probing attacks and then during your unlimited free move could abandon territories by pulling your troops back into an adjacent country. The abandoned country was then assigned as neutral (rebels, in that game) or was given to an adjoining player.
Anyway, it added an interesting twist which might prove valuable here as an option, especially with certain maps.