“NATO promised to not entrench themswvles into Russia’s sphere of influence back in 1985”
No. They didn’t. Stop getting your news from Russian propaganda outlets.
As for the “NATO expansion” narrative, this too is Russian propaganda. The interim Ukrainian government that came in after the revolution were firmly against joining NATO. That changed when Putin annexed Crimea.
In fact, Putin’s aggression over the last decade has created the biggest expansion of NATO basically since its founding. He’s not responding to the growth of the alliance, he’s fuelling it.