But Taiwan and its semiconductors are far more important to America’s economy than Ukraine is — meaning it would very likely be far more difficult for the United States to stay out of a conflict involving Taiwan. Taiwan accounts for half of the overall production of microchips that are critical to the functioning of mobile phones, consumer electronics, cars, military equipment and more. South Korea, the nearest competitor, has about 17 percent of the overall market. But Taiwanese chips are the smallest and fastest, and its foundries account for 92 percent of the most advanced designs. “It’s almost impossible to...