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...
With DJI being forced out of the market, there is a growing market for companies that can repair drones and rebuild the batteries. Companies like AG Express are already in this space.
Do NOT throw the old batteries away take them to someone that can make you new ones with the shells Most electronic repair people know how to do it and its actually an up and coming way to make good money.