How much longer can the West afford to support Ukraine against Russia?

With Boris Johnson and others saying the war in Ukraine could go on for years, the question has to be asked: how much longer will the West go on funding and arming Ukraine to fight off the Russians? The West is confronted by an impossible dilemma: it cannot afford to shell out billions of dollars for ever to help Ukraine defend against Russia but it cannot afford not to because to allow Russia to achieve its objectives would be a calamity. Putin cannot be allowed to win this one. He won Crimea without a fight. He cannot be allowed to seize territory in eastern and southern Ukraine and hang on to it for ever. But, in reality, how is the West going to stop it happening without going to war with Russia? Is anyone seriously looking at the options? Boris Johnson makes trips to Kyiv and is the poster boy for Ukraine but does he for a moment stop and think about whether this can go on for ever? All we hear is that the war could continue for years. But what will this mean for Europe and the West and for the world? It's time to consider the options.