Hey Admiral Beez,
re "Which is the real reason Russian wants eastern Ukraine. To steal Ukraine's oil and to prevent the EU from gaining a gas-rich member."
FWIW, I agree that is most likely part of it. I have been wondering if it is a combination of the following factors (not in order of importance).
1. Spite and pride, involving many things, including that Ukraine's (pre-war) living standard was on its way to significantly surpass Russia's in the next few years.
2. Putin and friends, and the oligarchs, may have exploited Russia's own people and economy to its practical limits. Hence they are looking for external material for exploitation. War is, after all, usually good for the economy (as long as your country is not the one being destroyed).
3. To prevent the Ukraine taking a significant amount of Russia's share of trade with Europe (particularly involving Ukraine's growing petroleum industry) - exacerbating item #2 above..
4. Old men in power, old men who's minds are degrading and regressing to wishful thinking about the good old days, and how they could have been a contender if only . . . Also possibly linked to item #1 above, as many old people become fixated on past real or imagined affronts to their real or imagined sensibilities. The apparent willingness of Russia to destroy entire cities and manufacturing centers, and food sources, strikes me as an example of the spite and/or temper tantrum equivalent of "If I can't have it, I will make sure you can't have it either".
I do not buy that Putin is actually ignorant enough to be afraid of NATO in an existential sense. As long as Russia has an effective nuclear arsenal, there is no way that NATO can be a military power based existential threat to Russia - at least not unless it is a suicidal one. And if the West was interested in implementing a MAD scenario there would be no need for comparatively little things like expansion of NATO.
Just some thoughts.