9K111 Fagot (RS-AT-4 Spigot)

The 9K111 Fagot (NATO reporting name AT-4 Spigot) is a second-generation, man-portable anti-tank guided missile system developed in the Soviet Union. It is designed to engage tanks and other armored targets at ranges up to 2,500 meters, utilizing a semi-automatic command to line of sight (SACLOS) guidance system.

Developed by the Tula Machinery Design Bureau in the late 1960s, the system was created to replace older manual-guidance missiles with a more reliable and easily operated infantry weapon, officially entering Soviet service in 1970. It saw widespread combat deployment during the Soviet-Afghan War, the Gulf War, and various 21st-century conflicts, including the Syrian Civil War and the Russo-Ukrainian War. Despite its age, the system remains in active service with dozens of militaries worldwide and continues to be a highly prolific infantry anti-armor weapon due to its vast production run and rugged design.