1831 Paskievitch takes Warsaw. The building of new Roman Catholic churches in Poland is prohibited.
1832 Poland is incorporated with Russia. The constitution granted by Alexander is annulled, and Poland is divided into five governments.
1833 By the Treaty of Unkiar-Skelessi Russia obtains additional rights to meddle in the internal affairs of Turkey.
1839 A Russian expedition to the khanate of Khiva is compelled to return.
1849 A Russian army is sent into Hungary. Capitulation of Görgei at Villagos.
1853 The Crimean War. The Russians occupy the Danubian principalities. Destruction of the Turkish fleet at Sinope.
1854 France and England join Turkey. Battle of the Alma. Siege of Sebastopol. Fall of Bomarsund.
1855 Sardinia joins the allies. Battles of Balaklava, Inkerman, and Tchernaia. Fall of Sebastopol. Bombardment of Sveaborg. The Russians take Kars. Nicholas I dies. His son Alexander II succeeds him.
1856 Treaty of Paris. Russia relinquishes the mouths of the Danube and a portion of Bessarabia, restores Kars, gives up the protectorate over the Oriental Christians and the Danubian principalities, and agrees to have no war vessels in the Black Sea.