AIM-9X Sidewinder

Washington has approved a $214 million sale of AIM-9X Sidewinder Block II missiles to Lithuania, the U.S. Department of State announced, handing the NATO ally a significant boost to its short-range air defense arsenal. The deal covers 152 additional AIM-9X Block II tactical missiles, eight tactical guidance units, and six captive air training missiles — gear that plugs directly into an existing Lithuanian order and brings the combined package to 168 total missiles and 10 guidance units. RTX Corporation, headquartered in Arlington, Virginia, is named as the principal contractor. The sale builds on an earlier Lithuanian purchase that flew under the congressional notification radar. That original case, valued at $19.5 million with $10.5 million in major defense equipment, covered just 16 AIM-9X Block II missiles and two guidance units — a modest starter package. The new approval merges both cases into a single congressional notification, reflecting how dramatically Lithuania's ambitions have scaled up. The combined package now includes 168 tactical missiles, 10 guidance units, six captive air training missiles, and a full suite of training, spare parts, weapon system support, and contractor engineering and logistics services. The State Department framed the deal in direct terms: it supports U.S. foreign policy and national security by improving the security of a NATO ally that plays an important role in European stability. The sale will not alter the basic military balance in the region — standard language in arms sale approvals, but language that carries particular weight in the Baltic context, where every new weapon system gets scrutinized through the lens of Russian threat perception. The AIM-9X Block II Sidewinder is one of the most capable short-range air-to-air missiles in the Western arsenal — and crucially, it serves as the primary interceptor fired by the NASAMS air defense system. Lithuania received NASAMS deliveries in April 2026, making this missile purchase a direct replenishment and expansion of that system's magazine. NASAMS — the Norwegian Advanced Surface-to-Air Missile System — is a ground-based launcher that fires AIM-9X missiles against aircraft, cruise missiles, and drones at short to medium range, giving Lithuania a proven, NATO-interoperable intercept capability that has already seen combat use in Ukraine. The AIM-9X Block II variant features a thrust-vectoring control system for extreme off-boresight engagements, a two-way datalink for in-flight target updates, and a redesigned fuze and onboard processors compared to the Block I. These are not simply anti-aircraft missiles — they are the ammunition that makes Lithuania's ground-based air defense network functional. Lithuania's geographic position makes air defense a top national priority. The country shares borders with Russia's Kaliningrad exclave to the southwest and Belarus to the east — two of the most militarized corridors on NATO's eastern flank. Lithuania's own intelligence service warned in its most recent annual threat assessment that Russia is expanding brigades along NATO's eastern borders into divisions, standing up new military units, and deploying a new Iskander-M missile brigade in its western military district. An upgraded radar in Kaliningrad is now capable of monitoring airspace deep into NATO territory. Against that backdrop, Vilnius has been on a sustained buying spree. Lithuania has pledged to spend between five and six percent of GDP on defense from 2026 to 2030 — a figure that dwarfs NATO's two-percent guideline and exceeds even Poland's ambitious targets. That spending is funding a layered air defense architecture built from multiple systems. In January 2026, Lithuania ordered additional Bolide missiles from Sweden's Saab worth $326 million, with deliveries expected between 2028 and 2032. In December 2025, the country added a third Mobile Short Range Air Defense system for roughly $148 million. Lithuania has also signed on to purchase Germany's IRIS-T missile system. The AIM-9X Sidewinder purchase slots into the short-range layer of that architecture, directly feeding the NASAMS launchers already on Lithuanian soil. The six captive air training missiles included in the package allow Lithuanian crews to practice targeting and engagement procedures without expending live rounds — essential for building the proficiency that makes a missile inventory actually useful. That training dimension matters: a battery of NASAMS with full magazines is only as effective as the operators running it. The AIM-9X is already deployed across more than 30 foreign military sales partners worldwide, and recent approvals have included the NATO Support and Procurement Agency purchasing missiles on behalf of Belgium, Italy, and Romania. The pattern reflects alliance-wide recognition that short-range air defense capacity needs shoring up across the eastern flank — not just in individual countries. NASAMS itself has become one of NATO's most common ground-based air defense platforms precisely because of its interoperability and proven effectiveness: Ukraine has used the system to intercept Russian cruise missiles and drones since 2022.

AIM-9X Sidewinder

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AIM-9X Sidewinder

U.S. clears $214 million AIM-9X missile sale to Lithuania

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About The Defence Blog