This is an existential fight for Russia and it doesn’t matter to the US or EU. That alone determines the outcome.
This will be the outcome.
Russia rolls in and takes the east and south of Ukraine...simply no contest against the pitiful Ukraine army.
Western Ukraine implodes and is nothing but a hopeless basket case surviving on handouts from the US taxpayers.
Russia warns against the western part of Ukraine joining EU or allowing any foreign forces on their soil.... they will comply.
If EU gives Russia a hard time they will pay through the nose for less gas than they need to survive. The gas ration will be cut but the income for Russia will increase. This is what happens when you let enviroweenies get you into such a dependent state.
Of course, it is possible that an incompetent like Obama will do something stupid. If he does Russia and China will retaliate by sinking the US dollar as the world’s reserve currency. Then we will all be dirt poor and pitiful :-( We are not in good shape financially. OR it could mean WW3