All of the interrelated actions that took place between Russia and Ukraine in the past decade or so have been short, negotiation attempts, or from NATO's view, not significant enough to warrant involvement. They were often internal to Ukraine or as in the case of the capture of Crimea, quick enough to avoid intervention. The two nations have been in a pas de deux for quite some time with smoldering violence and the pretense of trying to solve things peacefully (Minsk?). The invasion and subsequent destruction wiped away any pretense that Russia was trying to work out a peaceful solution. It would force its way through a full blown war of destruction. When the tanks rolled across the borders in Feb 2022, the Russians were saying: screw Minsk, screw discussions, screw the smoldering resistance Russia supported in the Donbas, they will take what they want and install the government they want in Kyiv.