Moscow has long been suspicious of foreign messaging apps. WeChat’s weak encryption makes it vulnerable.

© Pavel Bednyakov/Associated Press

A directive from Russia’s domestic security service was part of a cache that was advertised online by a cybercrime group.

© Maxim Shipenkov/EPA, via Shutterstock

Russia’s spy hunters are increasingly worried about China’s espionage, even as the two countries grow closer.

© Evgenia Novozhenina/Reuters