NATO Alliance Cohesion and Iran Contingency Planning: US Strategic Burden-Sharing Expectations

Executive Summary

The US military's Force Model reductions in Europe and previous brigade cuts are part of a broader Pentagon shift to reallocate more resources to the Pacific to deter China, championed by Pentagon policy chief Elbridge Colby as part of the Trump administration's vision for "NATO 3.0." The Iran war has accelerated and politicized that reallocation, exposing a structural gap between what Washington demands of European allies, what those allies can actually field, and what they are politically willing to do. The result is a NATO entering its July 2026 Ankara summit with rising spending numbers but persistent capability voids, while US air and naval assets stripped from European commitments flow toward the Indo-Pacific theater where a second simultaneous contingency is the organizing fear.

The Capability Gap That Spending Cannot Close In Time

European allies are spending more. The evidence for that is solid. What the spending figures obscure is the difference between budget authorization and fielded capability. The European Union Institute for Security Studies notes that Europeans possess only limited deep-strike capabilities of their own. The planned US deployment mattered because it would have stationed Tomahawk and Dark Eagle missiles in Europe, systems with a range of between 1,600 and 2,800 kilometers. Europeans have no comparable systems. They have capable indigenous systems with a range of up to 500 kilometers, but they lack equivalent longer-range options.

The Geopolitical Monitor reported in May 2026 that among European NATO members, only Turkey currently fields conventional ground-launched ballistic missiles with ranges above 300 kilometers. No other European NATO state operates a ground-launched cruise or ballistic missile capable of reaching beyond that distance. The continent does field air-launched cruise missiles, including Storm Shadow, Taurus KEPD 350, JASSM and JASSM-ER, but they require survivable aircraft to deliver them, and stockpiles have been heavily depleted by transfers to Ukraine. The Royal Navy's Tomahawk Block IV/V missiles remain the longest-range conventional missiles in service with any European NATO member, but the inventory has always been small.

This hardware gap translates directly into economic and political risk. The interplay between European defense industrial limitations and US withdrawal from bridging commitments creates a deterrence window that adversaries can observe and potentially exploit. Defense News reported that Europe will moderate-to-high confidence need until the early 2030s to develop some of the critical defense enablers, with establishing robust air and missile defenses taking five to ten years according to analysts. Europe is better positioned in areas such as strategic airlift and aerial refueling, but the US through NATO provides high-end capabilities critical for effective combat operations, including command and control, satellite intelligence, and deep strike, which European allies either lack or field only in limited capacity.

These military capability shortfalls spill directly into economic and strategic domains. European defense industries are being asked to scale production precisely when industrial supply chains are already operating at capacity, when procurement decisions require 8-to-12-year lead times, and when fiscal space is being compressed by competing social spending demands. The resulting spillover affects multiple sectors: defense firms face demand surges they cannot absorb without multi-year investment, governments face bond-market pressure from rapidly rising defense budgets, and the strategic credibility gap itself feeds risk premiums into European energy and financial markets as investors price in proximity to a NATO with uncertain US commitment.

The Indo-Pacific Reallocation Calculus And Its Ambiguity Problem

The military pressure translates directly into Asia-Pacific deterrence planning. Pentagon policy chief Colby has called for a "NATO 3.0" where Europeans would assume primary responsibility for the conventional defense of Europe as the US prioritizes the Western Hemisphere and the Indo-Pacific. He warned about the possibility that potential opponents will act simultaneously across multiple theaters, whether in coordinated fashion or opportunistically.

The assets being reallocated are precisely those most needed in both theaters. The United States intends to redeploy major naval and strategic assets, including an aircraft carrier, a missile-launching submarine, associated warships, and carrier-based aircraft. One of the two bomber task force groups currently assigned to Europe would also be reassigned. Military experts indicate that the reduction could affect NATO's immediate ability to conduct independent long-range strike missions and large-scale aerial surveillance operations.

The interplay between European burden-sharing requirements and Indo-Pacific deterrence needs creates a strategic tension that the 2026 National Defense Strategy has not fully resolved. According to the Congressional Research Service's defense primer on INDOPACOM, the 2026 NDS directs the Department of Defense to maintain a favorable balance of military power in the Indo-Pacific by erecting "a strong denial defense along the First Island Chain" and encouraging regional allies and partners to do more for collective defense. The US FY2027 budget request reflected this priority: the FY2027 Department of War budget request totaled $1.45 trillion, representing a $440.9 billion increase over FY2026, and explicitly identifies China as the primary pacing threat while aligning force development with Indo-Pacific operational requirements.

The problem is that the doctrine demands simultaneous forward presence in both theaters with a force structure designed for sequential not concurrent commitments. The Royal United Services Institute reported that NATO Secretary General Rutte has also spoken about the risk of two simultaneous wars in the coming years, China going to war over Taiwan while coordinating with Russia to keep them busy in Europe by attacking NATO territory, which would overstretch the US military, already under strain due to the war in the Middle East and planning to pivot to Asia since the Obama administration in 2011.

Both economic and military dimensions of this reallocation require attention. A US carrier strike group repositioned to the Pacific reduces European maritime deterrence, increases European risk premiums for energy shipping through contested corridors, and simultaneously raises questions for Japan and South Korea about whether the assets committed to their defense were already promised elsewhere. These geopolitical dynamics compound the existing economic uncertainty for investors in European defense primes and Asian semiconductor manufacturers who depend on stable US forward deterrence for supply chain continuity.

How The Ankara Summit Inherits An Unresolved Structural Problem

Fewer than a hundred days remain until the 2026 NATO Summit in Ankara, Turkey, and with the right agenda the alliance could solidify the achievement of last year's Hague Declaration, where US President Donald Trump pressed allies to spend 5 percent of their GDP on defense and defense-related expenditures by 2030. The headline numbers look reassuring from Washington's perspective. But the Intereconomics journal assessment noted that focusing narrowly on expenditure targets risks obscuring more fundamental challenges: in a security environment dominated by hybrid threats, Europe's ability to enhance security and peace depends less on uniform spending benchmarks than on effective capabilities, societal resilience, and coordinated contributions across countries.

The Ankara summit's mandate is therefore narrower than it appears. NATO Secretary General Rutte told allies that he expected members to present "clear, concrete and credible plans" to reach the 5 percent target, as reported by the BBC. National roadmaps are of uneven quality. The commitment to submit credible incremental plans by mid-2026 was met by most allies, but "credible" is doing significant work in that sentence: several plans project spending increases that depend on GDP growth assumptions that independent economists consider optimistic, or on defense industrial expansion that requires supply chains currently operating at capacity.

The 2026 National Defense Authorization Act creates an additional legal friction. A provision in the 2026 NDAA stipulates that the Pentagon may not reduce its posture in Europe below 76,000 troops. The US is not expected to go below that floor this year, though American officials have signaled that further cuts should be expected. The floor constrains the pace but not the direction of reallocation. Taken together, these developments, the legal floor, the Hegseth review, the cancelled German long-range fires deployment, and the Ankara roadmap pressure, frame a situation where European allies must fund their own deterrence faster than their defense industries can deliver it.

The broader geopolitical and systemic implications include a coalition coherence problem that pure military analysis misses: Spain, which received an exemption from the 5 percent commitment, refused Iran basing access while simultaneously being the country most publicly called out by Hegseth and Rubio. As Reuters reported in June, Trump announced he would pull out 5,000 of the 35,000 American troops in Germany and cancel the planned deployment of Tomahawks and other long-range missiles, a decision made after Chancellor Merz criticized the US handling of the Iran war. The pattern suggests Washington is using force-posture decisions as political leverage, which the Atlantic Council's Ellehuus characterized as "a form of reward, punishment or revenge" that "telegraphs to adversaries that US security commitments have a price tag," as reported by the Independent.

Counterarguments

1. European spending growth is real and the capability gap narrative understates allied resilience: The RUSI assessment acknowledged that NATO's spending rise of 90 billion euros (approximately $103 billion) last year represents a genuine increase in purchasing power for European defense, as Rutte confirmed allies were "already backfilling" US cuts. Poland at 4.7 percent of GDP, the Baltics, and Finland are building force structures that would have been unimaginable in 2019. The Geopolitical Monitor and Defense News analyses focus heavily on the gap's most exposed segment, deep-strike and long-range fires, while understating European progress in ground forces, air defense, and naval mine warfare, which are also relevant to NATO's primary threat scenarios. An analysis that treats "no deep-strike capability" as synonymous with "no credible deterrence" mirror-images US operational preferences onto a European strategic context where forward-deployed land forces and layered air defense may be sufficient against the most probable Russian threat scenarios.

2. The Iran precedent may be less transferable than Washington assumes: Hegseth's criticism rests on the premise that European base access during Iran operations was a NATO burden-sharing failure. The stronger counter-interpretation is that European states have treaty obligations, domestic legal constraints, and sovereign interests that differ from US strategic preferences in a Middle East conflict that most European governments did not regard as a NATO Article 5 obligation. Treating a refusal to support out-of-area operations as evidence of free-riding on European defense conflates two distinct legal and political categories. If that conflation drives US reallocation decisions, the reallocation could punish allies for exercising sovereignty in ways that do not actually affect NATO's core collective defense mission in Europe.

3. The simultaneous contingency logic driving reallocation may itself be the key vulnerability: The RUSI and beHorizon analyses both cite the two-theater simultaneity scenario as the organizing rationale for NATO 3.0. But the same logic that justifies pulling assets from Europe to the Pacific reduces the US's ability to deter the Russian opportunism the NATO 3.0 framework is supposed to prevent. US Air Force analysts cited by Air and Space Forces Magazine warned that a "strong denial defense" of the First Island Chain may involve "tradeoffs for other types of capabilities and concepts important for deterring Chinese aggression in theater." The assumption that force reallocation strengthens net deterrence may be wrong if adversaries coordinate their timing to exploit the transition period, precisely the scenario both Rutte and Colby have publicly identified as the primary risk.

Indicators To Watch

Decision Relevance

Scenario A (approximately 55 percent): Managed rebalancing, European capabilities partially fill gaps before US reallocation peaks. Under this scenario, the Ankara summit produces a credible implementation plan, European allies accelerate procurement of mid-range systems, and the Hegseth review recommends conditional rather than categorical drawdown. The deterrence void remains, but it is acknowledged and actively being closed. Recommended for defense procurement strategists and investors: accelerate exposure to European defense primes with deep-strike and assessed programs in their portfolios; hedge US contractor positions exposed to European theater contracts. Supply chain managers should begin mapping alternative sources for defense-grade components as European industrial base expands.

Scenario B (approximately 35 percent): US reallocation outpaces European capability delivery, creating an observable deterrence gap before 2030. The Hegseth review produces specific drawdown timelines; Germany and Italy struggle to translate spending commitments into fielded capabilities; the ELSA program encounters industrial bottlenecks. Russia or China interprets the transition period as an opportunity window. Recommended for risk managers: elevate exposure to scenarios involving energy supply disruption through northern European corridors; review contingency plans for scenarios in which US extended deterrence in both Europe and the Pacific becomes conditionally credible rather than unconditional; increase scenario planning for supply chain disruptions linked to Baltic or First Island Chain instability.

Scenario C (approximately 10 percent): Alliance fracture produces bifurcated NATO, with core members (Poland, Baltics, UK, France) operating a credible deterrence arrangement and peripheral members (Spain, Italy, parts of southeast flank) operating under ambiguous commitment. This scenario follows Spain-style exemptions proliferating, combined with US withdrawals from specific theater commitments. Recommended for corporate strategists with European operations: develop dual-track planning for both unified NATO scenario and bilateralized US-European security arrangements; identify which of your supply chains pass through states most exposed to ambiguous collective defense.

Analytical Limitations

• The specific asset-by-asset details of US cuts under the NATO Force Model have not been publicly confirmed. Der Spiegel figures (one-third reduction in jet fighters, one-half reduction in strategic bombers) are unconfirmed by Pentagon spokesman Sean Parnell, as reported by RUSI. If the actual cuts are materially smaller, the deterrence gap analysis overstates near-term risk.

• This assessment cannot evaluate classified annexes to the 2026 National Defense Strategy. The strategy's omission of Taiwan by name and its softened language on China may reflect deliberate strategic ambiguity rather than genuine de-prioritization, a distinction that matters enormously for Asia-Pacific deterrence calculations but cannot be resolved through open-source analysis alone.

• European public opinion data on defense spending willingness is not factored into this analysis. The Atlantic Council notes that the political capital required to maintain 5 percent GDP commitments is substantial, and voter preferences across France, Germany, and Italy constrain governments' ability to sustain multidecade spending trajectories. If domestic political conditions shift, the spending trajectory underpinning European capability development cannot be assumed.

• The Iran war's direct military outcomes and their effect on US strategic credibility in the Middle East are not assessed here. If the Iran campaign is perceived as a US strategic success, it may reduce allied reluctance to support future out-of-area operations. If it is perceived as costly or inconclusive, it may harden European resistance to burden-sharing demands linked to US-initiated conflicts.

• Capability timelines for European deep-strike programs are drawn from EU ISS, Geopolitical Monitor, and Defense News assessments that aggregate national procurement plans. Slippage in programs like ELSA, which has no confirmed first-delivery date, could extend the deterrence gap further than the 2028-2035 window assessed here.