Nato is very much involved .....
Keep in mind Putins grip is Nato Expansion......so what do you think Nato/Us has been installing in Romania and other Nato nations around Russia’s Border? The military instillations, equipment and on and on Putins many times objected to both in G-7 meetings and various others over two decades. He was basically given the finger. Everybody knows this....but nobody , obviously, thought when Putin said Ukraine was his red line believed he would follow through with what we see now.
You think nato will fight inside Ukraine? That is what I was referring to.