The Warsaw pact doesn't exist any more, so it's difficult to tell how Russia could violate the '90 treaty. It's not a member of the '99 treaty and the West never was. There's no real case for complaining about Russian non-compliance here.
And yes, the Cold War is over.
The problem here (and all over the world, all the time) is that humans get used to almost everything, real quick. They got used so much to the post-Cold War world that they
can freak out about 'threats' that would have been barely recognisable during the Cold War when the noise level of threats was much higher.
So yes, the Cold War is over and yes, Russia is a marginal threat to us now. The fact that Ukraine is not "us" is at the core of the current crisis. They did NOT join "us", and thus Russia is still a very valid defence concern to them to say the least.
Their security problem isn't that Russia still has stockpiles of 25-50 year old military hardware. Their security problem is that they had a government which wasn't interested in preparing defences and their security forces are now ineffective even against the very small 'troops concentration' nearby.
A few hundred spec ops guys and a few ten thousand regulars are a seemingly insurmountable problem to the Ukraine because it has no loyal, competent, equipped security forces - their security forces are now less effective than Portugal's and that's no good in their neighbourhood.
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