Russian Foreign Ministry spokeswoman Maria Zakharova said that Armenia's tilt towards Nato was a cause for regret and concern, and said Yerevan's actions risked destabilising the wider South Caucasus region.
At her regular press briefing, Zakharova said that Armenia's closer relations with the US-led alliance caused "not just regret, but also concern for Armenia's future".
She added that Yerevan's shift towards the West risked "destabilising" the South Caucasus, a region in which Russia has traditionally exerted major influence.
Yerevan, traditionally Russia's closest regional ally, has stoked warmer ties with the Nato alliance in recent years as its ties with Moscow have become more strained.
Armenian officials blame Russia for failing to protect it from long-time rival Azerbaijan, which retook the former breakaway region of Nagorno-Karabakh in September 2023.
Zakharova said that US-Armenian military exercises, set to conclude on July 24, were also a cause for alarm, especially after Yerevan froze its participation in the Russian-led Collective Security Treaty Organisation (CSTO) earlier this year.