In order to add War Thunder to NOD32 exceptions, please, do the following (Note! These steps are valid only for NOD Smart Security versions.):
1. Open NOD32. Double click a NOD icon in windows tray (right bottom corner of the screen). A window will pop up.
2. Press Options, then press Advanced Options.
3. Select Exceptions, then click Add
4. Select game folder and press OK.
5. Finally, press OK and close settings.