Yanukovich had just signed an agreement to stay in office and run the government until there were election in December. He still had control of the military and security services. And yet the coup mysteriously forced him to take his money and run to - Russia.
And it is, of course, just a coincidence that Russia is the country that has benefited most (except for some dead soldiers and more spending on the military) from the surprising departure of Mr. Yanukovich. Crimea is now reunited with Mother Russia. And soon more of eastern Ukraine will be 'reunited' whether they all want it or not.
And in your version of history the day after the 'coup' Ukraine's army started to attack the peaceful people of Eastern Ukraine. OK. 
What the disparity in military spending also shows is that Russia has absolutely nothing to worry about in terms of a threat from Ukraine. Unfortunately, national governments that do have a history of spending more on the military than they did before the attack. I agree that military spending is "completely non-productive and inherently destabilizing" whether is in Ukraine or in Russia.
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