I have a complicated situation involving four major powers. The below chart will summarize their relations. Both sets of allies are using simultaneous movement.
France Russia Spain Turkey
France XX Allied War ---
Russia Allied XX War War
Spain War War XX Allied
Turkey --- War Allied XX
French and Russian fleets are blockading the Spanish and Turkish fleets at Cadiz.
Spain & Turkey wish to run the blockade together as one stack. Who can intercept and why?