Who is the northwestern  neighbor of the country that boarders Iran on the northeast?
Iran:  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. Turkmenistan: Turkmenistan ( or ; Turkmen: Türkmenistan/Түркменистан/توركمنستان , ), formerly known as Turkmenia, is a country in Central Asia, bordered by Kazakhstan to the northwest, Uzbekistan to the north and east, Afghanistan to the southeast, Iran to the south and southwest, and the Caspian Sea to the west.
Kazakhstan