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Armenia’s only regional ally was Russia. When the USSR dissolved, Armenia and Azerbaijan started fighting over areas and borders (borders had less importance while they were inside the USSR). Both countries have enclaves inside the other one IIRC. Azerbaijan is supported by Turkiye. So Armenia relied on Russia and Russian peacekeepers to maintain access to their enclave inside Azerbaijan.
To Russia, Armenia was interesting as it made them feel important in “keeping the peace”, “resolve international conflicts”, build the CSTO to “rival NATO”. 
Now that Russia has a lot on its hands it didn’t respond to Armenia’s call for help when Azerbaijan became more hostile a couple of months ago. So Armenia is left to fend for itself.
Armenia pretty much left to fend for themselves. Russia cares more about their relationship with Azerbaijan than they do with Armenia unforunately. >

Anyone want to tl;dr the significance of Armenia to Russia for me?