While human factors, such as "humiliation" will always play a part in human endeavors, we need to be careful to not overly focus on the factors that make the most sense, or that are the most soothing to our own perspective on an issue. Do Russians feel humiliation? probably some at some level, but equally they feel fear as we press NATO deeper and deeper into their vulnerable side.

This is best viewed in terms of geostrategy, spheres of influence and national interests. Russia has acted consistently over the centuries to attempt to shore up an extremely vulnerable western flank that has been attacked repeatedly by western European powers.

This does not make Russia "right" to act out to increase their security - but we can hardly objectively assess recent events if we assume that it is we that are "right" instead. Geography does not care about politics and power, but it certainly shapes how those things play out.