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.
I’ve had it installed for a while. Didn’t use it much, but it was fun to see the pop ups from people out of address book joining telegram.
There were some usual suspects of kind of ‘sceptical’ folk, but also some surprises like my aunt.
The novelty wore off quickly though