Ukrainians are some of the bravest people I know.
To the extent that you can, do not use Telegram. Telegram is owned by a single person. This man is a fucking liar.
Telegram infrastructure is linked to the FSB.
https://www.occrp.org/en/investigation/telegram-the-fsb-and-the-man-in-the-middle
Signal is more secure and owned by a nonprofit. The founder of Signal is a professional cryptographer.
https://en.wikipedia.org/wiki/Moxie_Marlinspike
Signal delivers end-to-end encryption by default and collects almost no data.
nah both are ugly, but out of the messengers I have tried only telegram and whatsapp have the problem of randos adding me to crypto scam chat groups without any option to decline before it starts pinging me with notifications.
you want to go into settings > privacy > invites > change to my contacts
that will stop the random channel invites