The 9K133 Kornet is a modern man-portable anti-tank guided weapon of Russian origin. In the West it is known under the NATO designation AT-14 Spriggan. The Kornet was developed as a more capable and longer range alternative to the late Cold War era 9K111 Fagot (AT-4 Spigot) and 9K113 Konkurs (AT-5 Spandrel) in Soviet service. Since the Kornet is heavier and more expensive it was allways intended as a supplementory system, not a system to replace all existing systems in use.

Externally the Kornet system looks similar to older Soviet manpack anti-tank guided weapons. The tripod launcher houses the sight unit and a single missile in its launch container. The 9M133 missile has an unconventional internal layout. The nose houses the guidance section, but the laser beam sensor has to be located at the rear on order to function. Also the warhead is located behind the rocket fuel. This has the advantage of allowing more time for the precursor charge to detonate explosive reactive armor, but comes at the cost of having more components between the plasma jet and the target. Occasionaly the plasma jet is deformed with much reduced penetration as a result.

The Kornet has good penetration statistics on paper. Its tandem HEAT warhead may penetrate well over 1.000 mm RHA behind ERA. Alternatively a thermobaric warhead is available for use against structures and infantry in the open. The Kornet has a good range of 5.5 km in daylight and 3.5 to 4.5 km when using the night sight. The Kornet-M has an increased maximum range of 8 to 10 km. The subsonic missile does take about half a minute to reach its maximum range.

The Kornet is a man portable system. The tripod launcher with a missile ready to fire weighs about 66 kg. When the load is divided over multiple people the Kornet can be carried over long distances by infantry. However, most standard operating procedures have the Kornet and its crew transported by vehicle. Vehicle mounted launchers often use a pedestal mounted manpack launcher. Various multiple round vehicle based launchers have been developed, but these are yet to be produced in quantity.

The Kornet has been in Russian use since the late 1990's, but not in large numbers. It has been exported in both small and large numbers. Most export users are located in the Middle East, where it has already been used in various conflicts. The Kornet is also used by several South American and African nations.