Military invasions are very expensive and will not necessarily work. The fact that they are largely shut out of the global market means they will have difficulty funding and gathering the necessary resources to supply their war machine
Should that become necessary, can you point out which resources Russia would lack and would need gathering? As for funding...
https://www.youtube.com/watch?v=HGOtFphPLzcMaintaining an army as big as theirs is expensive. They probably can't wait to use, that's why they're flexing, flying their bombers to Britain, pushing on Ukrakine and performing maneuvers near the border.
You are putting the cart before the horse here. First, Russian military expenses are not that large, and the end-year reports were that they will be further reduced in 2015 - the military would be made more efficient by utilising the resources better.
Second, the "flexing" as you call it, is a standard military procedure for all countries designed to see how the opponents are doing. What do you think American military planes doing near the Russian border, and sometimes venturing into Russian airspace over the Pacific? Sightseeing? (
A relevant read showing what this can lead to) Another such example is Georgian invasion of South Ossetia - one of its missions was for NATO to test Russian defences and response-readiness.
It's when Western MSM start blaring about these routine fly-bys is that you know that NATO/US is looking to an excuse to increase its military spendings...
And as for Ukraine... The anniversary of the US-lead violent coup d'etat is close, and the sooner USA gets the hell out of Ukraine, the better. Or does Russia need to start getting involved in Mexico?