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In page Crimean War:

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As a result, the Treaty of Hünkâr İskelesi was signed and greatly benefited Russia. It provided for a military alliance between the Russian and the Ottoman Empires if one of them was attacked, and a secret additional clause allowed the Ottomans to opt out of sending troops but to close the Straits to foreign warships if Russia were under threat. Egypt remained nominally under Ottoman sovereignty but was de facto independent.[citation needed]