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

Citing national security issues, Ukrainian officials on Friday said the country's government agencies, military and critical infrastructure will be restricted from using the Telegram social media app.

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

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

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