Military cooperation between Armenia and Russia is based on both states being members of the military alliance (CSTO) as well as participants in the Joint CIS Air Defense System.
Russia maintains in Gyumri (formerly, Alexandropol), north of Yerevan, one of its military bases abroad (102nd Military Base) as part of Russia's Transcaucasian Group of Forces; the relevant treaty was extended until 2044 in 2010.
Moscow also undertook to supply Armenia with more weapons and military hardware.
On 8 December 2015, the Erebuni base (part of 102nd) was reinforced with six advanced Mi-24P assault helicopters and an Mi-8MT transport helicopter delivered from the Russian Air Force base in the Krasnodar region.

The Russian border guards directorate in Armenia (c. 4,500 strong) along with the Armenian border guards is responsible for the protection of the Soviet-era border of Armenia with Turkey and Iran.

In October 2013, the chief commander of Russia's 102nd military base Andrey Ruzinsky told Russia's official military newspaper, "If Azerbaijan decides to restore jurisdiction over Nagorno-Karabakh by force, the [Russian] military base may join in the armed conflict in accordance with the Russian Federation’s obligations within the framework of the Collective Security Treaty Organization."

On 23 December 2015, Russian defence minister Sergey Shoygu and his Armenian counterpart, Seyran Ohanyan, signed an agreement to form a Joint Air Defense System in the Caucasus.
The conclusion of the agreement followed the Armenian minister's assertion that the ceasefire with Azerbaijan over the breakaway region of Nagorno-Karabakh virtually no longer existed.
In June 2016, Armenia's National Assembly voted 102–8 to ratify an agreement to create an Armenia–Russia joint air defense system.

In 2016, it was reported by media that Armenia had received from the Russian state a divizion of Iskander-M ballistic missiles (earlier, in 2013, it was revealed that Russia had deployed several Iskander missile systems at undisclosed locations throughout Armenia.)
In February 2017, the Defence minister of Armenia told a Russian mass media outlet that the Iskander missiles stationed in Armenia and shown at the military parade in September 2016 were owned and operated by the Armed Forces of Armenia.

In November 2016, Russian president Vladimir Putin approved a government proposal on creating joint Russian and Armenian military forces.
The two sides were to set up a joint command, whose leader would be appointed by the Supreme Commander of the Armenian Armed Forces in agreement with the Supreme Commander of the Russian Armed Forces.
In early October 2017, the relevant bilateral treaty was ratified by the Armenian parliament.

In mid-October 2017, the Armenian cabinet approved a bill for signing a $100 million worth credit agreement with Russia to facilate the weapons purchase in line with the domestic legislation.
Military cooperation between Armenia and Russia is based on both states being members of the military alliance (CSTO) as well as participants in the Joint CIS Air Defense System. Russia maintains in Gyumri (formerly, Alexandropol), north of Yerevan, one of its military bases abroad (102nd Military Base) as part of Russia's Transcaucasian Group of Forces; the relevant treaty was extended until 2044 in 2010. Moscow also undertook to supply Armenia with more weapons and military hardware. On 8 December 2015, the Erebuni base (part of 102nd) was reinforced with six advanced Mi-24P assault helicopters and an Mi-8MT transport helicopter delivered from the Russian Air Force base in the Krasnodar region.
The Russian border guards directorate in Armenia (c. 4,500 strong) along with the Armenian border guards is responsible for the protection of the Soviet-era border of Armenia with Turkey and Iran.
In October 2013, the chief commander of Russia's 102nd military base Andrey Ruzinsky told Russia's official military newspaper, "If Azerbaijan decides to restore jurisdiction over Nagorno-Karabakh by force, the [Russian] military base may join in the armed conflict in accordance with the Russian Federation’s obligations within the framework of the Collective Security Treaty Organization."
On 23 December 2015, Russian defence minister Sergey Shoygu and his Armenian counterpart, Seyran Ohanyan, signed an agreement to form a Joint Air Defense System in the Caucasus. The conclusion of the agreement followed the Armenian minister's assertion that the ceasefire with Azerbaijan over the breakaway region of Nagorno-Karabakh virtually no longer existed. In June 2016, Armenia's National Assembly voted 102–8 to ratify an agreement to create an Armenia–Russia joint air defense system.
In 2016, it was reported by media that Armenia had received from the Russian state a divizion of Iskander-M ballistic missiles (earlier, in 2013, it was revealed that Russia had deployed several Iskander missile systems at undisclosed locations throughout Armenia.) In February 2017, the Defence minister of Armenia told a Russian mass media outlet that the Iskander missiles stationed in Armenia and shown at the military parade in September 2016 were owned and operated by the Armed Forces of Armenia.
In November 2016, Russian president Vladimir Putin approved a government proposal on creating joint Russian and Armenian military forces. The two sides were to set up a joint command, whose leader would be appointed by the Supreme Commander of the Armenian Armed Forces in agreement with the Supreme Commander of the Russian Armed Forces. In early October 2017, the relevant bilateral treaty was ratified by the Armenian parliament.
In mid-October 2017, the Armenian cabinet approved a bill for signing a $100 million worth credit agreement with Russia to facilate the weapons purchase in line with the domestic legislation.
Armenia–Russia relations