From what I recall Ukraine has one of the largest militaries in Europe. However, I doubt the nation nor the military can offer anything that reassembles a united front. Unification of purpose is what’s needed to repel a Russian route. The Western interests will need help, but no Western country is in any position to help. That’s what I think based on my limited knowledge. I hope this thing doesn’t get wheels and drag us in. If so, Obama has to go by hook or crook.
You've just described Afghanistan, which was (and remains) divided by race, ethnicity and tribe - Tajik, Hazara, Uzbek, Pashtun and a bunch of smaller groups with distinct languages - when the Soviets invaded. There's plenty any interested party can do to help without sending troops. Using a few billion dollars of foreign aid, Afghans wore the mighty Red Army out after less than a decade of hostilities and 13K Russian dead. If the Ukrainians are prepared to fight, the Russians will leave, probably only after a protracted guerrilla war, but leave they will.
In 1951 CIA covert operations chief Frank Wisner estimated that some 35,000 Soviet police troops and Communist party cadres had been eliminated by guerrillas affiliated with the Ukrainian Insurgent Army in the period after the end of World War II.Bandera's guerrillas fought with no outside help. It's not clear that today's Russians are prepared to deal with this kind of death toll. And the Russians conducted mass killings of hundreds of thousands of Ukrainians to keep their casualties low (in the tens of thousands). Would they get away with that in modern-day Ukraine? Maybe, but not without triggering a flood of foreign weaponry to the Ukrainians.