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.
Israel pounded Lebanon with more than 120 air strikes on Tuesday in one of the heaviest days of bombing in weeks, Lebanese security sources said, as Israeli Prime Minister Benjamin Netanyahu said his military was deepening its operations in the country.
Syria's transitional leadership has located remnants of former President Bashar al-Assad's clandestine chemical weapons programme, including raw materials and munitions similar to those used to carry out deadly gas attacks during the country's long-running civil war.
US President Donald Trump, who turns 80 next month, said "everything checked out perfectly" after having his physical on Tuesday at Walter Reed National Military Medical ​Center, following a year of public attention on apparently minor health issues.
US Secretary of State Marco Rubio said on Tuesday negotiating a deal with Iran could "take a few days," quashing hopes for an imminent end to the conflict a day after US forces conducted what Washington called defensive strikes in southern Iran.