I'm currently working on a quantitative assessment of national power (political, economic, and military) with an optional extended scale of science and social (soft power) dimensions. The intent is to capture the full breadth of a state's power. I've only included United Nations members. The methodology enables me to see what percentage of the global power pie that each state owns. These are the top five:

National Power
1. United States (16.23%)
2. China (7.47%)
3. Russian Federation (6.20%)
4. Japan (4.23%)
5. France (2.98%)
...
41. Ukraine (0.44%)

However, when looking at economics, the USA drops to #2 while Russia drops to #10. And when looking at military power, the USA and Russia occupy #1 and #2 respectively. Whereas the United States has 34.14% of the 'military pie', Russia has 15.27%. NATO military strength is 46.17% while CIS/CSTO is 15.75%.

So, a couple of insights bearing on this situation:

1) Russia is a 'great power' in the traditional realist sense. It is capable of exercising hard power on its neighbors. I suspect when I complete the extended scale, it's rank will decline on account of its underdeveloped 'soft power'.

2) Ukraine has no hope of defending itself alone against Russia.

3) NATO deterrence is only effective when the alliance operates in unison - the split positions diminishes NATO power. The combined military strength of NATO countries bordering Russia or Ukraine (Norway, Poland, Hungary, Romania, Slovakia, Lithuania, Estonia, Latvia) amount to 0.706%. That's hardly a credible threat to Russia. France, Germany, Italy, Turkey, and the UK have 10.02% military strength compared to Russia's 15.27%. In other words, an effective military option is dependent on the United States, but as we know, the importance of Crimea and Ukraine varies between Washington, Berlin, and Warsaw.