SR 4 is a type of surface-to-air missile system developed by Russia. It is designed to target and destroy various aerial threats, including aircraft and drones. The system is known for its advanced radar capabilities and high accuracy, making it effective in modern warfare scenarios. The SR 4 can be deployed in various military operations and is often integrated with other defense systems for enhanced protection. Its mobility allows it to be positioned quickly in response to threats, providing a strategic advantage in defense operations.