This is a fundamentally incorrect analysis in so many ways. The West can't intervene directly because of the likelihood of nuclear escalation. Ukraine had the resources to fight this war without Western aid, but having that aid has made the defense more effective. Getting the Ukraine army equipped and trained up to western standards won't happen overnight; it will probably take a year or more. Meanwhile, I'd expect the goal of the West is to create a stable outcome. If that means giving Russia a bloody nose so they think twice before invading again, then so be it. If it takes an extended guerrilla war lasting a decade, well that will be up to the two sides to resolve.