Can US sustain a long Ukraine guerrilla war against Russian invaders?
The Ukraine is not a fertile ground for guerrilla warfare. Unlike the U.S. in Afghanistan, thousands of miles away, the Ukraine has a long border with Russia. The Ukraine has a fairly well developed infrastructure that Afghanistan never had so that these assets couldn't be destroyed to suppress the locals. It already was in the "stone age". Ukrainian power plants (that also supply heat), bridges, airports, etc. are terribly vulnerable. Also the presence of millions of ethnic Russians in the Ukraine terribly complicates its ability to defend itself even if the majority of ethnic Russians don't support the assumed invasion. Enough probably will to create an unhealthy "5th column". What US "aid" to a post invasion Ukraine will do is greatly increase the suffering and death of the population with no real possibility of success.