Wrong. Russia's relations with Armenia aren't cold. Armenia gets to buy Russian military hardware at preferential rates, which the Azeris do not. But Armenia is poor and has nothing, both of which cannot be said about the Azeris, and Russia gains nothing from losing Azerbaijan as friends as well.
This whole new attack by the Azeris was at least prepared in coordination with the Turks, if not even orchestrated by the Turks in the first place. Hence the Bayraktar drone strikes and the Jihadis from Syria fighting on their side. "Counteroffensive" my . That was also the excuse the last time.