When Skydio, an American drone maker, was hit with Chinese sanctions over its sales to Taiwan in early October, the company tried to gird itself against potential fallout by moving its supply chains out of China. It didn’t move fast enough.  Within weeks, Skydio’s Chinese battery suppliers had cut the company off. By month’s end, its chief executive announced the company was rationing the batteries it supplies with its drones to customers, which include Ukraine’s military and the