Russia said they wouldn't invade Ukraine because:
-Russia is holding military exercises, you're being paranoid
-Nobody invades a european country on a wednesday (ok, that's true. They did it on a tuesday)
-Russia is pulling back troops.
-Russia will pull back troops as soon as the military exercises are done. So (previous) sunday. (or not!)
-Russia isn't invading Ukraine, we're just sending peacekeeping forces into the region that we declared independent of Ukraine.
etc... These aren't negotiation tactics to resolve future NATO membership concerns. These are stall tactics to position their military.
What Russia did strengthens the resolve of Ukraine to seek an alliance with NATO although they wouldn't qualify for membership. The more likely reason is that Russia hopes to undermine NATO. By taking Ukraine and putting themselves at the border of NATO countries, they can test if there's going to be a 2 tiered NATO. Countries for which the alliance is willing to invoke art. 5, and countries they are willing to abandon to avoid a world war.