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.

Telegram is used by Russia for phishing, spreading malware, establishing user locations and calibrating missile strikes, officials said.

"I have always advocated freedom of speech, but the issue of Telegram is not a matter of freedom of speech, it is a matter of national security," Ukraine's military intelligence chief, Kyrylo Budanov,

By Christopher Bing and Munsif Vengattil WASHINGTON/BENGALURU (Reuters) - Stolen customer data including medical reports from India's biggest health insurer, Star Health, is publicly accessible via chatbots on Telegram,

The Star Health chatbots feature a welcome message stating they are “by xenZen” and have been operational since at least Aug. 6, said UK-based security researcher Jason Parker

The data is available for free in small portions, while bulk data — amounting to 7.24 terabytes — is being offered for sale, according to a hacker using the alias “xenZen.”