There is no way to hold India if Japan plays a capture Calcutta at all cost opening strategy. It will fall and Japan will get a bit more income. Meanwhile, they will not be able to control China and will be missing out on big income from Pacific islands. Celebrate if they are putting a huge fleet in SZ39 because ANZAC + China will have huge income for the foreseeable future.
Can Russia build ships in sz 100 and then move through the straight?
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Or do you have to own Turkey?
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The Allies have to control Turkey at the beginning of the Russian turn for Russia to move ships through the Straits.
Also, according to the rule book: “If a canal or narrow strait is controlled by a power not on your side, but with which you are not yet at war, you must ask permission to use it, which may be denied.”
So in a very theoretical situation, Germany could capture Turkey before being at war with Russia, and allow Russian ships to pass through the Straights. But I don’t think that ever happens.