 Complete the following phrase:  In 1711, when Peter I of Russia went on a campaign with all his troops 80,000 to gain access to the Black Sea, he was surrounded by the army of the Crimean Khan Devlet II Giray, finding himself in a hopeless situation. And only the betrayal of the Ottoman vizier Baltacı Mehmet Pasha allowed Peter to get out of the encirclement of the Crimean Tatars. When Devlet II Giray protested against the viziers decision, his response was: You should know your Tatar affairs. The affairs of the Sublime Porte are entrusted to me. You do not have the right to interfere in them. Treaty of the Pruth was signed, and 10 years later, Russia declared itself an empire. In 1736, the Crimean Khan Qaplan I Giray was summoned by the Turkish Sultan Ahmed III to Persia. Understanding that Russia could take advantage of the lack of troops in Crimea, Qaplan Giray wrote to the Sultan to think twice, but the Sultan was persistent. As it was expected by Qaplan Giray, in 