The United States issued a new rule on Friday tightening visa guidelines for Chinese journalists, saying it was in response to the treatment of U.S. journalists in China, a shift that comes amid tensions between the two nations over the coronavirus global pandemic.

The United States and China have been engaged in a series of retaliatory actions involving journalists in recent months.

In March, China expelled American journalists from three U.S. newspapers, a month after the United States said it would begin to treat five Chinese state-run media entities with U.S. operations the same as foreign embassies. One day after the U.S. verdict on the state-run entities, Beijing expelled three Wall Street Journal correspondents, two Americans and an Australian, following the publication of an opinion column that China denounced as racist.