Who is the northwestern  neighbor of the country that boarders Iran on the northeast?
Iran Iran (Persian: ایران‎ ‎ "Irān " ] ), also known as Persia ( ), officially the Islamic Republic of Iran (Persian: جمهوری اسلامی ایران‎ ‎ "Jomhuri-ye Eslāmi-ye Irān " ), is a sovereign state in Western Asia. With over 79.92 million inhabitants (as of August 2017 ), Iran is the world's 18th-most-populous country. Comprising a land area of 1648195 km2 , it is the second-largest country in the Middle East and the 17th-largest in the world. Iran is bordered to the northwest by Armenia, the "de facto" independent Republic of Artsakh, the Republic of Azerbaijan, and the Azerbaijani exclave of Nakhchivan; to the north by the Caspian Sea; to the northeast by Turkmenistan; to the east by Afghanistan and Pakistan; to the south by the Persian Gulf and the Gulf of Oman; and to the west by Turkey and Iraq. The country's central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz, give it geostrategic importance. Tehran is the country's capital and largest city, as well as its leading economic and cultural center.
Outer Manchuria Outer Manchuria or Outer Northeast China (Chinese: 外满洲 (Wài Mǎnzhōu) or 外东北 (Wài Dōngběi); Russian: Приаму́рье or "Priamurye") is an unofficial term for a territory in Northeast Asia that was formerly part of the Chinese Qing dynasty and now belongs to Russia. It is considered part of the larger historical region of Manchuria which also includes the modern-day Northeast China. Russia officially received this territory by the unequal treaties of the Treaty of Aigun in 1858 and the Treaty of Peking in 1860. The northern part of the area was also in dispute between 1643 and 1689.