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It's obviously not in the Turkish interest for Iran to have nukes. But it's also illogical to assume that they would nuke Israel, since that would kill a lot of their own customers in the process.
Russia continues to support Iran's programme as we speak. It is illogical to assume that the centuries old expansionist tendencies of Russia have suddenly been reversed. What better way for Russia to suppress US interests in the area than to have a pirate there armed with nukes?