Mongolia – Russia

The 2,166-mile-long border between Mongolia and Russia runs along the northern boundary of Mongolia. The Treaty of Kyakhta, an agreement between the Russian Empire and the Qing Empire, outlines the parameters of the current border between the two countries. The initial contract guaranteed that Tuva would stay inside Mongolian territory. However, the territory of Tuva broke away from Mongolia and came under Russian rule after the collapse of the Qing empire. Ten official crossing points between Mongolia and Russia have been established by their respective governments.

Since the Soviet Union backed the Mongolian People's Republic throughout the Communist era, relations between Mongolia and Russia have historically been good. The Organization for Security and Cooperation in Europe accepts both nations as full members (Russia is a participating state, while Mongolia is a partner). 90% of Mongolians, according to a 2017 survey, have a good opinion of Russia (38% "strongly" and 52% "somewhat"), whereas 2% have a negative opinion and 6% have a neutral one.

Length: 3,485 kilometers