Armenia has been Russia's closest ally in the Caucasus since independence: a member of its military alliance and its customs union, host to a Russian base, dependent on Russian gas. In 2020 and again in 2023 Azerbaijan defeated it and Russia did not intervene. Since then its prime minister, Nikol Pashinyan, has frozen Armenia's part in the alliance, invited European monitors to the border, won re-election in June 2026 on a promise of Europe, and in August began the process of applying to join the European Union. Moscow says the two memberships cannot be combined.
The wider region and the powers around it: The South Caucasus between Russia and the West.
Where it stands · September 2026
On 1 September 2026 Putin invited the Armenian prime minister to Moscow and disagreed with him over leaving the Eurasian Economic Union. On 8 September Yerevan lodged a complaint with the EAEU over Russian restrictions on Armenian products, and an Armenian parliament committee approved an EAEU free trade agreement with Indonesia. On 16 September Russia said it would not finance Armenia's preparations for European Union membership. On 17 September Russia cut off gas to Armenia, days after Armenia announced diversification.
What the dispute is about
What an alliance is for. Armenia's treaty with Russia and its allies promises help if a member is attacked. When Azerbaijani forces struck inside Armenia in 2022, the alliance sent a fact-finding mission. Moscow says Karabakh was never covered and the border was undefined. Armenians concluded the guarantee was empty.
Two unions. The European and the Eurasian unions are both customs areas with a common outer tariff. No country can be in both. Armenia wants the European prospect without yet leaving the Eurasian market, where it sells most of what it exports.
Whose choice. Russia asks for a referendum. The government says the election was one.