The same campaign previously criticized pro-democracy demonstrators in Hong Kong.

Whether Operation Secondary Infektion had a strong influence remains unclear.

This disclosure comes days after U.S. military officials publicly admonished foreign governments for exploiting the pandemic to fan anti-American sentiment.

China has abandoned rigid information control and pulled a page out of Russia's playbook: spreading chaos.

Operations from Iran, Malaysia and Vietnam also were identified by the social media company's researchers.