The country has spent decades perfecting a surveillance state at home. Now it’s promoting its ideology of state control, and the technology to enforce it, abroad.

At the heart of a criminal case involving one such wife is a question: How can Taiwan protect its democracy without unfairly targeting Chinese migrants?

Under a new “ethnic unity” law, Mandarin Chinese must now be the language of teaching. Parents must guide their children to love the Communist Party. Neighborhoods should be mixed.

Beijing has condemned the U.S.-backed strikes on Iran, a close partner. Yet with trade talks looming, it is unlikely to risk a rupture with Washington.