How would Russia provide arms to Armenia right now? Georgian air space is closed. Iranians are wary of internal issues and have strained relationship with Russia at the moment as well.
With regards to Georgian airspace, you are wrong. There are even commercial flights between Moscow and Yerevan with a connection flight through a Russian airport right on the border with Georgia, I'm looking at one right now for this Wednesday. If there are commercial flights, there are most definitely military/cargo flights. Even if I'm wrong about commercial flights, Georgia's capacity to restrict military flights by Russia is limited at best.
Regarding Iran, I don't know what kind of "strain" there is between Iran and Russia that didn't always exist. They are competitors in some sense, but certainly allies. Heck, Russia today announced that they will be selling S-400 system to Iran very soon. There have been confirmed Kamaz trucks going from Iran to Armenia, and even Iran to Armenia via Karabakh, in the past few weeks. If you think they're carrying bananas and car parts, I have a bridge to sell you...
Edit: My apologies, I am the one who is likely wrong about Georgian airspace. Attached is a flight path taken by a Russian foreign ministry official, probably Lavrov, to Armenia today. However, this photo gives you an idea of how Russia can get stuff into Armenia I guess...
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