(1833) Alliance between the Ottoman Empire and Russia, signed at the village of Hünkâr 0130; skelesi (Unkiar Skelessi), near Istanbul.
In return for Russian military aid, the Ottoman sultan, Mahmud II, agreed to a secret article in their mutual defense treaty that closed the Dardanelles Strait to any foreign vessels of war except those of Russia. The treaty made the Ottoman Empire a virtual protectorate of Russia. When other countries became suspicious of the agreement, Russia abandoned its Dardanelles privileges in 1841.