Yes, that plan is the cleverest cheat of the game. My opponents are too smart for that though.
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.