Passengers of China-bound flights must provide negative COVID-19 test results before boarding, China's aviation authority said on Tuesday.
It comes as the government looks to further reduce the risk of imported coronavirus cases amid increased international travel.
Nucleic acid tests must be completed within five days of embarkation, the Civil Aviation Administration of China (CAAC) said on its website.
Tests should be conducted at facilities designated or recognised by Chinese embassies in host countries, it said.
The embassies will carefully assess the testing capacity of host countries and formulate travel procedures when testing conditions are met, CAAC said.
The announcement comes as countries struggle with testing capacity and speed. In parts of the United States, receipt of test results can take up to two weeks, while in some other countries, nucleic acid tests are reserved for people who have come in close contact with COVID-19 patients or who have symptoms of the potentially fatal disease.
In the past month, CAAC has allowed more foreign airlines to resume services in China and add flights to the country as the economy recovers.

US peace envoys meet Zelenskyy in Kyiv after Putin talks
US targets three Iranian oil vessels after attack on Navy ships
Four killed in Israeli strikes on southern Lebanon
Indonesia's Anak Krakatau eruption halts flights, schools, fishing
Putin says US-Russia contacts beneficial as talks begin with Witkoff and Kushner
Chinese national rescued from Nepal tunnel 10 days after flash flood
US envoys Witkoff, Kushner arrive in Moscow for talks on peace in Ukraine
One dead, 11 people missing after mudslide in China's Jiangxi province
