In order to add War Thunder to Kaspersky exceptions, please, do the following:
1. Open Kaspersky Antivirus. Double click the Kaspersky icon in windows tray (right bottom corner of the screen)
2. A window will pop up. Press Options in the right top corner.
3. Go to Advanced Options. Highlight "Threats and exceptions", then click "Settings".
4. In the brought window select "Trusted Programs" tab and press Add.
5. Locate a game folder and select launcher.exe file.
6. Choose all exceptions.
7. Repeat steps 4 to 6 with "aces.exe" file.
Press OK and close antivirus window.