You can, but since there was already a Metin2 server licensed for the Russian region (metin2.ru), you will probably be IP blocked by Metin2 SG. You can get around it by using anti blocking tools.
Newest one, easiest to useOlder, different versionThe first one passes your login information through a third party server apparently ran by a player from elitepvpers (amongst other things, a metin2 hacking / private server site), so maybe take it with some salt/caution.
The older version proxies everything through a more reputable source (established game proxy service), though you will get higher lag.