For warranty work, you would have to have it shipped back to DJI from a Korean address. The warranty will only be valid inside Korea.
The alternative would be to send it to a reliable shop that can repair DJI equipment.
Military grade weapons wouldn't be needed to take down a consumer drone. Any bullet that goes up tends to come down. The response would be commensurate with the risk.
Another drone would be able to take down or disrupt an invasive drone. All you...