Answer: Ok The Treaty of Constantinople (Treaty of İstanbul) was a treaty between the Ottoman Empire and the Kingdom of Bulgaria signed on 29 September 1913 after the Second Balkan War at the Ottoman capital Constantinople. The signed treaty was an important strategic achievement which provided for Russia the access to Azov Sea and facilitated the preparation for the war with Sweden. The Treaty of Constantinople, concluded for 30 years, was observed up to November 1710, when Turkish sultan declared war to Russia.
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