Obviously since these countries now have some handle on the virus they don't want to import new cases and seed new outbreaks, but there is some interesting stuff in this article on their methods re: travel, quarantine, tracking, punishments.

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Hong Kong, a semiautonomous Chinese city, initially managed to contain its early coronavirus outbreak with swift measures like the closing of schools and government offices and restrictions on travelers from mainland China.

But as students and expatriates rushed back from Europe and the United States in March, officials warned that a new wave of imported cases was beginning to strain hospitals. Hong Kong’s leader, Carrie Lam, barred all nonresidents on March 19, and returning residents are now tested upon arrival.

During a 14-day quarantine at home, they wear tracking bracelets, and their movements are monitored by a smartphone app. Ms. Lam said that more than 200,000 people were currently being quarantined at home.

Technology is a key tool for enforcing quarantines. In China, returnees spend 14 days in government-assigned hotels and send their temperatures daily to neighborhood committees on WeChat, a messaging service. In Taiwan, the government uses location tracking on mobile phones and adds some old-fashioned police shoe leather; officers visit people at home if they leave or turn off their phones.