Dardanelles/Gallipoli battle in WW2

What if the Bospourus strait is a battleground once more during WW2 ? Who are the participants what could be the strategic gain ?
 
Ermmm... neutral Greece and Bulgaria, Britain wants to open a supply route to the Soviets, but Axis/Axis-leaning Turkey says no? Much like WW1 in other words.
 
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