I don't know to what extent Ukraine competes with Russia on military arms and supplies that they produce in Ukraine. They do compete in the global arms market and as you know, it's big business.

How many MANPADS does a million $ buy?

As for the economic desperation in Russia, it is also happening in Ukraine. Ukrainians are slow to protest, unless paid and organized to do so, but there are plenty in Ukraine who would benefit from this discontent. In Russia, it seems less straightforward as the opposition doesn't seem to have much room to maneuver.