Gummigismo,
If you install Panzar from
http://www.panzar.com you get asked to install it on c:\games\panzar.
Then you have the EU version and connection.
If you install Panzar from
http://www.panzar.ru you also get asked to install it on c:\games\Panzar
CHANGE for RU in something else like c:\games\PanzarRU
Recreate the shortcuts to c:\games\panzar\start.exe for the EU
Or if you did RU first then recreate the shortcute to the RU.
This should fix your problem and you'll be able to play on the EU and RU