The Russian parliament will review on Friday a protocol extending Russia's use of a military base in Armenia.
Russia and Armenia signed amendments to a 1995 bilateral treaty extending Russia's use of the 102nd Military Base in Gyumri near Armenia's border with Turkey through 2044.
The amendments stipulate that the term will be automatically extended every five years unless one of the sides notifies the other about the annulment of the treaty six months in advance.
The base is under command of Russia's North Caucasus Military District and is part of the CIS integrated air defense system.
There are around 5,000 personnel at the base, as well as S-300 surface-to-air missile systems and MiG-29 fighters.
Russia has repeatedly said that the presence of its base in the Central Asian republic does not violate any international agreements or upset the balance of forces in the region.