Changing Balances During The 1787-1792 Ottoman-Russian And The Treaty Of Jassy Relations with Russia which is known in Ottoman diplomacy as Moskofstarted as a commerce relation on friendly terms by way of Crimean Khan during the reign of Mehmed the 2nd which over time transformed into a conflicting relation due to the struggle for dominance over Crimea. The age of Katerina the 2nd was a significant period for the Ottoman-Russian political relations. Because the Russian foreign policy during this time was focused on eliminating the Ottoman Empire and founding an Istanbul based Byzantine Empire. In this study, the causes for the 17871792 war between Ottoman-Russia and Austria, Treaty of Jassy that took place after the war and the contributions of European states during this treaty period have been taken into consideration.In the course of the agreement, especially Britain and Prussia's efforts to protect the territorial integrity of the Ottoman State as diplomatic attitudes and mediator states have been elaborated on the basis of correspondence. As a result of the efforts of the mediatory states, the Treaty of Jassy was signed between the Ottoman State and Russia on January 10, 1792, and thus the ongoing war with Russia was concluded.The main resources of the study are comprised of documents in the Presidential Ottoman Archives along with the records on this treaty found in the London Parliament Archive. The records in both archives were used for evaluating a cross-section of the historical relationship between Ottoman-Russia.