Korea - AIM-9X Sidewinder Block II Missiles

August 21, 2026

The U.S. Department of State has made a determination approving a possible Foreign Military Sale to the Republic of Korea for AIM-9X Sidewinder Block II tactical missiles and related equipment. The estimated total cost is $125 million.

The Republic of Korea has requested to buy one hundred and three (103) AIM-9X Sidewinder Block II tactical missiles; and ten (10) AIM-9X Sidewinder Block II Tactical Guidance Units. The following non-major defense equipment items will also be included: active optical target detector; training; weapon system support; training aids and devices; spare parts; U.S. Government and contractor engineering, technical, and logistics support services; and other related elements of logistics and program support. The estimated total cost is $125 million.

This proposed sale will support the foreign policy and national security objectives of the United States by improving the security of a major ally that is an important force for political stability and economic progress in the Indo-Pacific region.

The proposed sale will help improve the Republic of Korea’s capability to meet current and future threats by expanding its air defense capability, deterring aggression in the region, and ensuring interoperability with U.S. Forces. The Republic of Korea will have no difficulty absorbing these articles and services into its armed forces.

The proposed sale of this equipment and support will not alter the basic military balance in the region.

The principal contractor will be RTX Corporation, located in Arlington, VA. At this time, the U.S. Government is not aware of any offset agreement proposed in connection with this potential sale. Any offset agreement will be defined in negotiations between the purchaser and the contractor.

Implementation of this proposed sale will not require the assignment of any additional U.S. Government or contractor representatives to the Republic of Korea.

There will be no adverse impact on U.S. defense readiness as a result of this proposed sale.

Source : US Department of State