Since the Chinese company’s chatbot surged in popularity, researchers have documented how its answers reflect China’s view of the world. Some of its responses amplify propaganda Beijing uses to discredit critics.

A new report details how a covert influence operation linked to the Kremlin continued to place ads on Facebook despite U.S. and E.U. prohibitions on doing business with the organization.

The briefs, filed a week before oral arguments, offered sharply differing accounts of China’s influence over the site and the role of the First Amendment.