Oh you mean after Russia invaded Crimea? And even if NATO was “in Ukraine” like you say, that’s no reason to go to war. Russia has a nuclear deterrent. It doesn’t need a buffer state. This isn’t the 1890s.
Countries have a right to self determination. So even if Ukraine was looking to join NATO, which it wasn’t, that is not a valid reason to invade your sovereign neighbor. The number one driver of NATO expansion is Russian aggression.
Funny