Ukraine is strategically very important to Europe and the US. Taiwan is even more vital to the world. Biden and his recent predecessors have realized it and have since shifted the focus to Asia. George W Bush had poor judgement and invaded Afghanistan. He tied the huge US military assets in useless Afghanistan for decades until Biden finally called the shot to withdraw them and redeploy them to the Far East.
The direct victims of Putin’s invasion are Ukraine and Europe as a whole. Yet if the US sits on the sideline, it loses its moral ground as the world’s cop. This war will end when the aggressive Russia is reduced to a shell of its former self. The Europe will enjoy peace for decades to come, and the world will focus on the other lone bad actor, China.