Telegram is heavily used in both Ukraine and Russia and has become a critical source of information since the Russian invasion.

The ban affects government officials and military personnel, over concerns about Russian cyber-attacks.

The Ukrainian government has banned the use of the Telegram messaging app on state and military mobile phones in a bid to prevent Russian spying.

Ukraine has banned government officials, military personnel and other defense and critical infrastructure workers from installing the popular Telegram messaging app on state-issued devices.

In announcing the ban, Ukraine says it's uncovered evidence that Russian agents can access private user messages on Telegram, including deleted correspondence.

Ukraine bans Telegram for government, military, and infrastructure workers, citing national security and cyber threats.