Even if it were encrypted and the backdoor was controlled by the Russian state, logically that would make it safer than Facebook for anyone living in Western jurisdictions. The Russian government cannot get them and is hardly going to exchanging intelligence with its enemies.
Telegram is as safe as just using Facebook DMs (unencrypted), only it’s Russian.
I suggest you judge for yourself how safe that is.
Even if it were encrypted and the backdoor was controlled by the Russian state, logically that would make it safer than Facebook for anyone living in Western jurisdictions. The Russian government cannot get them and is hardly going to exchanging intelligence with its enemies.
To what extent is it Russian?