TAIPEI/QUANZHOU -- In the southeastern Chinese port city of Quanzhou, a near-derelict factory hit by U.S. sanctions four years ago has discreetly come back to life.

As the U.S. continues to attack China's chipmaking industry with sanctions, domestic tech champions such as Huawei are quietly working to build self-sufficient supply chains at home. © Illustration by Daniel Garcia
Battered by sanctions, Huawei leads the way in stealthily building a domestic semiconductor supply chain