Many ukrainian ISPs are blocking access to russian IP addresses, which makes launcher unusable: when it starts and tries to update the game it tries to send requests to 62.140.236.147 (and to 62.140.236.146), which is blocked in Ukraine:
HTML Code:
tracert 62.140.236.147
Tracing route to 62-140-236-147.fiord.ru [62.140.236.147]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms RT-AX57-4148 [192.168.50.1]
2 2 ms 1 ms 1 ms pool173-001.domashka.kiev.ua [78.27.173.1]
3 2 ms 2 ms 2 ms mx-v777.skif.com.ua [91.90.19.186]
4 * * * Request timed out.
The blocking is enforced by law which was issued after massive bot attacks from russia after the invasion, so Ukrainians can't just ask their ISP to stop blocking.