Russia's annexation of the Crimea and desire…
1787 CE
Russia's annexation of the Crimea and desire to make Georgia a protectorate, plus the Turks' attempts to foment a Tatar revolt, leads to a renewal of Catherine's war (it is rumored that she desires to absorb the Ottoman Empire).
Ottoman Sultan Abdülhamid, confronted with Russian designs, declares war on the Russian empire in 1787.