Please note that the NATO Russian vehicles mod has beened removed from the steam workshop, if you used Steam to download the mod it will have been removed or will be removed shortly.

You can iether use A3 Launcher to get the mod and access the server.

Alternatively download the mod from http://www.armaholic.com/page.php?id=27653, add it manually and continue using the arma launcher.

If you used steam and the mod has not yet been deleted you can avoid redownloading the mod by copying out of the .../arma/!workshop folder to any other folder in arma and manually adding it again in the launcher