So, what does Russia do here? If he doesn't follow through with his threats, Putin will look weak. If he does start another SMO, he's going to stretch an already over stretched army even further. If Russia fails in Armenia too, they will look really weak.
Armenians might want to get hold of as many anti-tank weapons as they can... and learn how to use them.
Not just that, but buy a tiny group of islands that sink below the see in the next 50 years. Whatever military value they have now won't last long.