i didn’t know you could place units in the black sea; i would have done it in my game as germany. i figured w/o turkey taken over that move was illegal. maybe someone more important, krieg, could verify this information.
You can place units in a seazone bordering a IC. Turkey is only important for crossing the Dardenelles from turkey to greece. This is useful so you don’t have to transport units to Africa but can move them from Europe to Africa.