Proof that Russia doesn’t fear NATO invading them is of course the collapse of their empire with no invasion but today it is the indifference to defenses they maintain against NATO, they want Ukraine and anything they need from other supposedly defensive areas threatened by NATO being on that border, they casually pull it out and send it to Ukraine invasion forces without a care in the world that they are leaving that NATO border area weak and only symbolically manned and equipped.
But the idea that Russia invaded Ukraine because it was afraid of being attacked by NATO is absurd. Anyone who makes that point is either dishonest, or ignorant. From the top down. And either way, knowingly or not, they're advancing false Russian propaganda.