if the soviets declare war on germany, they cant move any units out of the urals until 1942. if the germans attack first then this restriction is lifted. "Urals factory PPs may only be spent in the
Urals. Units starting the game (or built) in
the Urals may not move. This restriction
ends if the Germans invade the Soviet
homeland, or in 1942 (whichever comes
first). Movement of each unit in/out of the
Urals requires a SM; such moves can attack
into adjacent areas (border limit 1)."
Ah got it, I missed the distinction that Germany has to invade the Soviets to free up the Ural units.