Yes, it's moving eastward. (And yes, apparently we promised not to.) But why is it moving eastward? Because NATO invaded, say, Poland? No, because Poland desperately wanted into NATO. Why? Because they've had a taste (or a belly full) of Russian aggression, invasion, occupation, and even partition. They wanted into NATO because they're afraid of Russia.
So how are we the ones threatening these people again? The only threat we pose to Russia is to not let them push other people around. And if that's a threat to them, well, it says more about Russia than it says about NATO.