This is the best tl;dr I could make, original reduced by 82%. (I'm a bot)

> Japanese Prime Minister Fumio Kishida announced Tuesday that Japan will tighten border controls for COVID-19 by requiring tests for all visitors from China starting Friday as a temporary emergency measure against the surging infections there.

> China has been "Refining our COVID response in light of the evolving situation" while working with the global community, Chinese Foreign Ministry spokesperon Wang Wenbin said Tuesday.

> Japan will act flexibly while watching the development in China, he added, including halting the planned increase of flights between Japan and China "Just to be safe."

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