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Ukraine Bans Telegram Use For State, Military Officials.
(www.rferl.org)
This is a most excellent place for technology news and articles.
It is, which is why the comment didn't advocate for it. Signal has more robust encryption than telegram, but its not zero-trust. They should really be using private hosted services instead of public or pgp, but when battle kicks off you use whatever works and then go back and revise as needed when you're not dodging bombs.