Executive Summary
Open-source reporting (CSIS 'Last Rounds' April 2026; CNN 21 April 2026; Fortune) documents that the Gulf bloc (Saudi Arabia and Gulf states) Patriot PAC-3 stockpile was depleted by roughly 86% across the 39-day, 5.6-week active phase of the Iran war. Lockheed Martin is contracted to ramp Patriot output from about 600 units a year today to 2,000 a year by 2030 (a $4.76B multi-year contract awarded 10 April 2026), but the 2026 line cannot be surged on operational timelines. European IRIS-T SLM and SAMP/T orders were redirected to active theatres; MBDA has announced Aster output doubling through 2026 (Defense News). Lithuania's NASAMS expansion (third battery scheduled Q2 2028, €234M follow-on contract), 36-missile AMRAAM stockpile, $214M AIM-9X sale (24 April 2026), and 48-unit Merops AS-3 interceptor-drone pilot (22 April 2026) sit behind Israel, Saudi Arabia, Ukraine, and US strategic-reserve replenishment in the production queue. At a two-shot doctrine against ten cruise missiles a day, the existing AMRAAM stockpile lasts 1.8 days; even after the €234M expansion to roughly 140 missiles, it lasts 7 days, well inside the Iran-war collapse window. This is a doctrinal gap, not a procurement bottleneck. The Ukrainian and Israeli combat record shows that distributed mass — many cheap, dispersed effectors networked through common command-and-control — outlasts a small number of premium batteries. Gun-based systems like Gepard kill Shahed drones for about €1,500 a shot; interceptor drones at €3,000–10,000 close the cost gap against €20,000–60,000 Shaheds. The recommended next step is a Lithuanian Ministry of Defence study, conducted with Bundeswehr Panzerbrigade 45 (which already operates Skyranger 30 in Lithuania), the Latvian Origin Robotics BLAZE/EIRSHIELD programme (deployed in Estonia, Latvia, and Belgium since February 2026), and NATO Allied Air Command, that designs a five-tier architecture matched to Lithuanian geography and budget. The choice of systems, the size of each tier, and the procurement schedule are decisions for the Lithuanian Armed Forces and the Seimas Defence Committee.
The Problem
Russian and Belarusian air threats against Lithuania span seven categories whose combined daily generation rate exceeds any plausible Lithuanian premium-interceptor inventory. One-way attack drones (Shahed-136 / Geran-2, Geran-3 jet variant, Gerbera decoys) have run at a Ukrainian sustained baseline of 80 to 150 a day, with a single-wave peak of 810 on 7 September 2025 (hisutton.com). The March 2026 Russian total of 4,186 strike Shaheds works out to roughly 140 a day on average (Euronews, 2 April 2026). The Geran-3 jet variant cruises at 300 to 370 km/h and reportedly up to 9,000 metres altitude (United24 Media), above the engagement ceiling of every short-range air defence system in NATO inventory. Russian KAB and UMPB-5R glide bombs can be released from Belarusian airspace at 130 to 200 km standoff; RUSI estimated Russian KAB production at 75,000 units a year in 2025, a potential 205-a-day tempo. Cruise missiles (Kalibr, Kh-101, Iskander-K) cost €1 to 6 million each. Iskander-M ballistic missiles reach Vilnius from Kaliningrad in 102 to 146 seconds; Iskander-K cruise missiles from the Belarusian border in 130 to 175 seconds. Russian electronic-warfare systems (Borisoglebsk-2, Krasukha-4, Murmansk-BN) cover the entire Lithuanian theatre.
Lithuania's existing inventory in April 2026 is two NASAMS batteries (a third arrives Q2 2028 under a €234M contract), 36 AMRAAM missiles (expanding toward 140), a $214M AIM-9X Sidewinder package approved 24 April 2026, a 48-unit Merops AS-3 interceptor-drone pilot approved 22 April 2026, an APS energy-site counter-drone deployment, the Bundeswehr Panzerbrigade 45 organic Skyranger 30 in Lithuania, limited Stinger MANPADS, and the Estonia-Latvia-Lithuania FAAD-C2 trilateral fielded since December 2021 ($14.3M Northrop Grumman contract). The 23 September 2025 Šakalienė amendments to the Law on Aviation give the armed forces standing authority to engage airspace violations at machine speed. Three gaps remain. First, magazine depth: at two shots against ten cruise missiles a day, 36 AMRAAM lasts 1.8 days, 140 lasts 7 days. Second, cost mismatch: a €1 million AMRAAM against a €50,000 Shahed loses €950,000 a shot. Third, the Geran-3 9-km altitude band is unreachable by every short-range system; only the upper tier (NASAMS, IRIS-T SLM, SAMP/T) can engage it, and the upper tier is the layer in shortest supply.
Without action: In a saturation scenario modelled on Ukrainian operational data scaled to Lithuanian geometry, the upper-tier magazine is exhausted in 4 to 7 days. Point defence concentrates remaining capability on Vilnius and leaves Klaipėda LNG, Šiauliai air base, the LitPol and NordBalt grid links, and the Suwałki corridor undefended. NATO heavy reinforcement cannot arrive before air defence collapses; the Article 5 tripwire fails before reinforcements transit.
Lithuanian Context
Lithuania is the NATO frontline state most exposed to combined Belarus and Kaliningrad air threats: a 679-km Belarusian border, a 273-km Kaliningrad border, Vilnius 35 km from Belarusian territory. The April 2026 procurement reality (third NASAMS battery Q2 2028, €234M follow-on, AIM-9X package, 48 Merops AS-3, Bundeswehr Panzerbrigade 45 Skyranger 30 already in country, FAAD-C2 trilateral since 2021) is the live integration baseline. The architectural question is how to layer over it, not how to start from scratch. A 40-node short-range mesh covers roughly 2,000 km², or 3.1% of Lithuanian territory; the honest model is point defence around seven priority sites (Vilnius, Klaipėda LNG, Šiauliai, Kaunas, LitPol, NordBalt, Kruonis) plus mobile hand-off along the 952-km hostile-axis border, not blanket territorial coverage. Lithuania is absent from the named partner list of the 2 March 2026 Macron Île Longue speech (Germany, Poland, Netherlands, Belgium, Greece, Sweden, Denmark, plus the United Kingdom via Northwood) and is not party to the 9 May 2025 Tusk-Macron Treaty of Nancy or its first follow-up summit in Gdansk on 20 April 2026. The Élysée did not characterise the speech as exclusionary, so the analyst reading is 'absent from the list, not explicitly excluded'. Distributed sovereign air defence is the substitute for the extended deterrence Lithuania does not yet have.