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In March 1939 after the rebellion in Cartagena the Spanish Navy chose to flee to Tunisia where they were impounded and put in camps. Instead of going to the French who had already recognised Franco why don't they go to the Soviets.
Assuming they sail that way would Turkey allow them through the Straits if they said they were part of the Soviet navy?
How would this change the Black Sea with Soviets having almost double the size? Would they want to sally to fight in the Med with the British?