Abstract
Six months of American and Israeli operations degraded Iran’s military forces without breaking the Islamic Revolutionary Guard Corps, the institution that regenerates those forces. Washington has since shifted to denying the hard currency the Guard depends on. That instrument is right, but it will be judged by the wrong test if success requires Iran to give up its programs. Containment requires nothing of Tehran. This article applies Strange’s critical-factors construct to show what that can achieve, and how continuous financial denial, defined thresholds, and calibrated enforcement turn military success into enforced containment. The end state is a contained Guard that may survive but cannot pay for what makes it dangerous.
Military Success Without Political Resolution
Six months of American and Israeli operations degraded Iran’s military capabilities, disrupted its nuclear and missile programs, and killed senior leaders without producing political resolution. Iran’s governing system has neither collapsed nor accepted durable limits on its nuclear, missile, or proxy programs, and claims control of the Strait of Hormuz, which Washington disputes. US Central Command says transit routes are cleared of Iranian mines and American forces have escorted nearly 1,500 vessels through.
That points to something deeper than insufficient force. The campaign used the wrong model of the adversary, underestimating the Islamic Revolutionary Guard Corps (IRGC) as the institution that converts revolutionary purpose into military capability. Its ideology resists coercion. Its bureaucracy creates vulnerabilities coercion can exploit.
Regime change was called for at the outset and raised again since. A different Iran would be preferable, but producing one requires an invasion for which there is no appetite or capacity. The objective narrowed accordingly. The stated military objectives, destroying Iran’s missile forces and production capacity, its navy and air force, degrading proxy support, and denying a nuclear weapon, were substantially achieved, and losses that severe were expected to lead Tehran to abandon enrichment, missile production, proxy rearmament, and its claim on the Strait. Both versions asked Tehran to choose differently. Containment asks nothing of Tehran. It removes the means.
Destroying military assets attacks what the Guard fields rather than what lets it field anything. The IRGC’s mosaic defense absorbed the losses, the regime survived, and a harder leadership emerged. The campaign could destroy capabilities faster than it could alter the institution that regenerates them, and by the time policy shifted toward revenue, the internal argument in Tehran had been settled.
An alternative was identifiable before that. An April analysis argued that the IRGC’s critical requirement was not any particular missile, launcher, or commander but the oil revenue that financed regeneration. Military forces are degradable outputs. Revenue is what allows the institution to replace them.
What the campaign has not answered is how it ends. Degradation did not remove the Guard’s ability to impose costs or regenerate. The question is what pressure constrains the institution rather than its outputs.
Treasury’s August 24 Economic Outcast intensified a revenue-denial campaign run for years, extending it across the shipping, finance, and commodity networks that sustain regeneration. The instrument is right. The objective is not. Financial denial will not persuade Tehran to give up the programs, but it constrains what Tehran can rebuild. That narrower objective is the basis of enforced containment.
The requirement is what it always was. Deny the revenue, harden Gulf production and export, and strike reconstitution selectively, until the Guard cannot pay for what makes it dangerous.
The Adversary We Actually Face
The IRGC is not a conventional military organization responding to ordinary incentives. Its identity is tied to preserving the Islamic Republic, defending the revolution, and hostility toward the United States and Israel. The United States designated it a foreign terrorist organization in 2019, and its record spans four decades of attacks abroad and repression at home. Iranian leaders have called for Israel’s elimination, and the IRGC has built the means. It fields missiles and drones able to reach Israel and armed partners, including Hezbollah, Hamas, Iraqi militias, and the Houthis. Those objectives are integral to its legitimacy. Karim Sadjadpour drew the same conclusion from Kennan in 2010, finding that Iran’s revolutionaries rely on foreign threats for legitimacy and offer tactical compromise while hostility remains strategic. His prescription was political containment rather than military, a course outrun by events.
That does not mean Iran cannot bargain. Tehran has shown flexibility over timing and temporary agreements. The distinction is between means and ends, and the leadership that emerged from the war illustrates it. That was not foreordained. Pezeshkian and Speaker Ghalibaf pressed for negotiations and for prioritizing the economy, and the balance inside the government was contested. The August appointments settled it. Mohsen Rezaei, who commanded the IRGC for sixteen years, took the Supreme National Security Council as the supreme leader’s representative and then its secretary. Hossein Taeb, the former intelligence chief whose organization helped orchestrate the January crackdown, returned to head the Basij. The campaign changed the men at the top without changing the institution that selected them. The pressure applied did not change the leadership’s objectives. Its purpose should be constraint, not persuasion.
Iran is not the Soviet Union. Its power reaches outward through proxies, procurement, and revenue rather than massed force. The Guard is nevertheless a bureaucracy, and that machinery absorbed the killing of the supreme leader and much of its senior leadership without fracture.
This is the contradiction at the center of the American strategic problem. The Guard can be ideologically resistant to persuasion while materially vulnerable to constraint, and the link to oil is direct rather than inferential. About 47 percent of Iran’s military budget is paid in oil quotas rather than cash. Congressional testimony puts the IRGC in control of up to half of Iran’s oil exports by volume, up from about a fifth in 2021, with perhaps half of some $50 billion in annual earnings flowing through its channels. Treasury identifies Sepehr Energy Jahan Nama Pars as the sales arm of the Armed Forces General Staff, dependent on shadow fleet vessels willing to carry the military’s oil. These figures understate it, since those barrels settle outside the banking system. External reconstitution requires convertible currency earned abroad.
That dependency has a threshold. Total military and security funding ran to about $23 billion in 2025, roughly $12.4 billion through appropriations and $10.7 billion through crude quotas and special credits. Treasury reported planned armed-forces oil allocations above 500,000 barrels per day and $10 billion a year. The military holds priority in oil sales, and when allocated crude cannot be exported, the government must compensate it in cash, shifting the burden to the general budget. Only when total exports fall below the military allocation does a first claim on nothing become nothing. Since the blockade was reinstated on July 14, no Iranian crude has transited the Strait to reach China, and August loadings of 220,000 to 255,000 barrels per day were under half the planned allocation. That threshold has been reached. Oil beyond the blockade is a cushion, at 29 million barrels by Kpler’s count, enough to last into mid-October. Alternative channels solve a payment problem, not a revenue problem. They cannot replace oil earnings once the oil no longer reaches market, and overland routes have not taken up the slack.
From Adversary Model to Campaign Design
Dr. Joseph L. Strange’s critical-factors construct, carried into JP 5-0‘s center-of-gravity analysis, states the problem. A center of gravity is the source of power possessing the critical capabilities necessary to achieve an objective. Identifying one turns on the objective chosen.
For a campaign designed to constrain Iran’s regeneration of military power, the IRGC is the relevant center of gravity. An earlier analysis called oil revenue itself the center of gravity. That was shorthand. A center of gravity is an entity that acts, and revenue is what the actor requires. The Guard fields the missiles, secures the nuclear program, directs the proxies, runs internal security, and holds the Strait. Those capabilities share two critical requirements: hard currency and commercial access.
A requirement becomes a critical vulnerability only where it is reachable. Iranian oil must leave through fixed export infrastructure, move aboard identifiable tankers, find buyers in China, and produce funds Iran can access. The vulnerability is a system, not a single target.
A complete assessment must recognize coalition vulnerabilities. Containment depends on commercially reliable passage through regional chokepoints and on protecting concentrated, high-value military and energy infrastructure from sustained missile and drone attack. Both must hold for the pressure on Iran to be sustained.
JP 5-0 says commanders attack forces and functions concurrently and identifies sustainment as a function worth disrupting. Missiles and launchers are forces. Revenue is sustainment. Constrain to Contain follows. Financial denial runs continuously. Kinetic action denies export capacity at fixed nodes and enforces reconstitution thresholds. Strikes without financial denial destroy what revenue rebuilds. Financial denial without credible force is only a sanctions regime.
Constrain to Contain: Four Lines of Effort
Four mutually reinforcing lines of effort follow, none sufficient alone.
Deny supply. Kharg Island handles roughly 90 percent of Iranian crude exports, making its loading infrastructure the narrow link between oil in the ground and hard currency. The blockade demonstrates that physical denial works, but every hull on station is unavailable elsewhere. With exports already blockaded, disabling Kharg substitutes a fixed denial mechanism for a continuing maritime one rather than removing more oil from the market. The United States has twice struck Kharg, hitting more than ninety military sites while sparing the oil terminal. The advantage is operational. Precise strikes on loading equipment could deny comparable export capacity without indefinitely committing ships needed in the Indo-Pacific, and without destroying the terminal.
The price is escalation risk. Iran and its proxies can retaliate across Gulf energy infrastructure, striking production, export terminals, pipelines, and the tankers that carry them. Iran’s objective is not to protect its market share but to make the disruption cost Washington more politically than the revenue loss costs Tehran. Energy assurance is therefore part of a collective strategy of denying Iranian revenue and preserving Gulf oil access, not a courtesy to the Gulf states. That denies Iran its counter-leverage. Commercially reliable passage through Hormuz, protected bypass capacity, resilient Gulf infrastructure, and supply from outside the threatened waterways are necessary complements.
Deny demand. China took about 1.4 million barrels per day before the war. Demand is reachable through purchasers, refiners, intermediaries, shipping, and payment channels. Treasury has issued determinations against five sectors, but the objective is broader than designations. Iran will substitute toward gold, digital assets, and barter, none of which scales to replace seaborne crude. China’s willingness to absorb the costs of circumvention sets the practical limit. A barrel that cannot become hard currency has failed its military function.
Depreciate chokepoint leverage. Holding at risk roughly a quarter of world seaborne crude and petroleum trade gives the IRGC leverage disproportionate to its conventional strength. Military clearance is not the same as commercially reliable passage. Tankers move only when insurers, underwriters, and crews accept the risk.
The requirement now extends beyond Hormuz. Houthi gains around Bab el-Mandeb and attacks on Saudi bypass infrastructure show that redundancy fails when it merely moves the vulnerability. It works by multiplying the nodes an adversary must suppress at once, and every attempt to suppress them exposes the forces doing it. Resilience requires redundant export infrastructure, shared sensors, layered defenses, deep magazines, rapid repair, and suppression of the systems threatening passage.
Enforce reconstitution thresholds. Containment cannot become permanent bombing, and the June memorandum illustrates the gap. It authorized Iranian crude and petroleum transactions through General License X without defining what would be verified or what would follow a violation. Treasury revoked the license on July 7 after continued attacks on shipping. That is not enforcement. It is an interval.
Washington should define prohibited thresholds for enrichment beyond declared limits, missile production at scale, proxy acquisition of capabilities threatening infrastructure or maritime passage, and attacks on shipping. Crossing a threshold should trigger a response calibrated to the violation. The response should not be prescribed mechanically in advance. It should reflect attribution confidence, immediacy, prior warnings, escalation risk, civilian and economic effects, and feasibility. Consequences should be communicated where possible, with discretion preserved over form and scale. Persistent violations must carry a credible prospect of force or the thresholds become advisory. The objective is to restore the threshold without widening the conflict. With struck sites closed to inspectors, enforcement rests on national technical means, better suited to detecting enrichment and missile production at scale than proxy resupply. Thresholds should be drawn around what can be observed with enough confidence to support attribution and response.
Together, the four lines shift the campaign from destroying what Iran builds to constraining its ability to rebuild. Financial denial is continuous; kinetic action is reserved for observable violations.
Kennan’s Long Game: Risks, Duration, and the End State
Containment carries risk. Each use of force is an escalation decision, and Iran will adapt. Administering it means adapting with it.
The strategy may persist for decades. Kennan named no date. He argued that sustained counterpressure could increase the strains within an ideologically rigid system without requiring immediate change. The answer was forty-two years, known only in retrospect. Iran is not the Soviet Union, but the discipline is relevant. Success is measured by constrained capability, not by predicting internal change.
Collapse is not the measure of success. The record of economic pressure against entrenched regimes is poor when the test is capitulation. Sanctions ask an adversary to change its behavior by raising the price of noncompliance. Denial serves a narrower purpose. It takes away resources required to sustain prohibited capabilities whether or not the adversary changes its preferences. The relevant measure is not whether Tehran concedes politically, but whether the Guard retains the hard currency required to regenerate.
Conclusion
This ends not with capitulation and not on a date anyone can name. The end state is a Guard that may survive but cannot pay for what makes it dangerous. Containment succeeds if Iran cannot acquire a nuclear weapon, regenerate prohibited missile capacity, rearm proxies above defined thresholds, or extract coercive value from regional energy infrastructure and maritime chokepoints. Internal transformation may follow as a consequence rather than a prerequisite.
Military accomplishment and political change are different things. The campaign demonstrated how effectively American and Israeli power can destroy Iranian capabilities. Washington has begun attacking the revenue that rebuilds them. Enforced containment completes that shift by denying regeneration continuously and using force selectively to enforce observable limits.
Disclaimer: The views expressed are those of the author and do not reflect the official position of the Department of Defense or any agency of the US government.