The Dollar, the Embargo, and the Geopolitics of a Cuba Opening

On 22 May 2026, Polymarket's odds markets placed the probability of a US-Cuba economic deal by the end of the following month at roughly 25 percent — a one-in-four shot. The same markets gave a 9 percent probability that Iran would agree to surrender its enriched uranium within nine days. Both propositions reflected a moment of active, if still fragile, diplomatic signalling from Washington toward two capitals that sit outside the dollar order. A day later, on 23 May, Iranian state media reported that Tehran had formally denounced what it characterized as American interference in Cuban internal affairs, drawing an explicit if unexpected link between the two theatres. The question worth sitting with is not whether a deal happens — the odds suggest it probably does not — but what the framing of these negotiations reveals about how Washington calculates leverage when the currency of that leverage is the dollar itself.

The structural logic here is not difficult to trace. Sanctions regimes depend on a shared assumption that exclusion from the dollar system carries a cost actors will eventually choose to avoid. For six decades, that assumption held Cuba in a state of managed economic contraction. The same logic underpins the pressure campaign against Iran, where secondary sanctions on any entity processing oil transactions in dollars create a de facto extraterritorial reach that most financial institutions — even non-American ones — have found impossible to ignore. The question the current moment poses is whether that assumption is weakening on both ends of the relationship: whether the targeted states are finding sufficient workarounds, and whether Washington is discovering that the enforcement costs of dollar exclusivity are rising faster than the strategic returns.

The Cuban Calculus: Sixty Years of Managed Isolation

Cuba's economy has operated under some form of American sanctions since shortly after the 1959 revolution. The embargo — codified in multiple legislative acts and expanded through subsequent administrations — prohibits most American commercial activity with Cuban entities and penalizes third-country firms that deal with sanctioned Cuban counterparties. The cumulative effect has been documented extensively by economists studying sanctions efficacy: Cuba's GDP per capita sits well below regional peers, its infrastructure carries the visible marks of deferred investment, and its foreign exchange position has been structurally constrained by limited access to international banking corridors.

What the standard account often elides is the degree to which Cuban resilience has been enabled by a parallel architecture of support. Venezuelan oil subsidies, Chinese credit lines, and more recently diversified relationships with Gulf states and African partners have provided Havana with enough external ballast to avoid total economic collapse. The embargo has imposed costs — measurable ones — but it has not produced the regime-change outcome its architects anticipated. That gap between intent and outcome is the premise under which Washington's Cuba policy has operated for decades, and it is a premise that is now being questioned from inside the Beltway as well as from Havana.

The Polymarket odds placing a deal at one-in-four by end of June reflect genuine uncertainty rather than optimism. Negotiations of this kind are sensitive to domestic political constituencies on both sides — Cuban state enterprises and security structures face internal pressures from any opening, while American policymakers must navigate Cuban-American voter geography, particularly in Florida. The sources do not specify the precise terms under discussion, and no public statement from either capital has confirmed the parameters of what a deal might contain. What is clear is that the conversation is happening at a rate it has not happened in some years, and that market-based probability gauges are registering the shift.

The Iranian Echo

Iran's response to news of a potential US-Cuba opening, as reported by Iranian state media on 23 May, drew an explicit connection between the two diplomatic tracks. Tehran characterized American moves toward Havana as evidence of a broader — and, in its framing, illegitimate — effort to expand American leverage across the Americas. The denunciation is notable not because it is surprising but because it signals that Iranian strategists are monitoring American engagement with other targeted states with a view toward drawing conclusions about Washington's overall posture.

That monitoring is bidirectional. American analysts watching Iran have long noted that Tehran's approach to sanctions pressure has evolved through several phases: initial economic crisis in the 2010s, adaptive diversification of trade relationships, and a gradual deepening of ties with non-dollar financial infrastructure through Chinese banking channels and alternative settlement mechanisms. The structural lesson Iran draws from Cuba's survival under the embargo is not lost on Tehran's negotiators: that isolation can be managed, that alternatives can be built, and that the patience required may be longer than Western policymakers anticipated.

The Polymarket odds on Iran agreeing to end enrichment — at 9 percent by the end of May 2026 — reflect a widely shared assessment that no such agreement is imminent. Iranian officials have consistently linked any enrichment concessions to the removal of sanctions relief, and the sources do not indicate any shift in that position. The broader structural context, however, is that Iran has expanded its enrichment capacity substantially since 2019, approaching levels that make any agreement on the nuclear file a negotiation over existing reality rather than future constraints. That reality changes the leverage calculus in ways that the 9 percent odds may not fully price in.

The Dollar Architecture and Its Limits

What connects these two diplomatic theatres is the dollar's role as the primary instrument of American coercive power abroad. The mechanism is well understood in financial policy circles but often underplayed in general-interest coverage: because the vast majority of international trade and finance transits through dollar-denominated systems, and because American law reaches those systems with near-universal reach through secondary sanctions, Washington can impose costs on foreign entities without firing a shot or committing a single soldier. The tool is powerful precisely because it is financial rather than military.

Its limits are becoming clearer. States that conduct sufficient trade in alternative currencies, that route transactions through non-dollar correspondent banks, and that cultivate relationships with financial centres outside American jurisdiction can reduce their exposure to that leverage. Cuba's partnerships with Venezuelan state oil companies, Chinese state banks, and more recently with Gulf-based financial intermediaries have provided exactly that kind of insulation. Iran has gone further, building an oil-for-goods architecture that substitutes barter-like arrangements for dollar-denominated transactions. Neither strategy eliminates the costs of sanctions — trade volumes are lower, transaction costs are higher, and investment is constrained — but they demonstrate that the costs can be distributed in ways that do not produce capitulation.

This is the structural reality that appears to be driving Washington's recalculation. The question is not whether sanctions impose costs — they do — but whether those costs produce the stated policy objectives. Six decades of Cuban policy offer a negative answer. The Iranian case is ongoing, but the trajectory — expanding enrichment, deepening non-dollar trade networks, maintained regional influence through proxy relationships — suggests a similar conclusion. When the policy instrument repeatedly fails to deliver its stated goal, the rational response is to reconsider the instrument.

What a Cuba Deal Would and Would Not Change

The sources do not confirm the specific terms under negotiation, and speculation about the final shape of any agreement would exceed what the evidence supports. What can be said is that any normalization of economic relations between Washington and Havana would represent a significant departure from six decades of stated American policy. It would also be, for that same reason, a signal — to other targeted states, to allies who have backed American sanctions policy, and to domestic constituencies in both capitals.

The signal to other targeted states is the most consequential. Cuba is not Iran, and whatever lessons each case offers must be applied with care. But the message that American policymakers are willing to reconsider an embargo that has run its course without producing its stated objective carries implications for how other governments evaluate their own exposure to dollar-based sanctions. If Washington can move on Cuba, the argument runs, the permanence of American sanctions orthodoxy is less absolute than it has been presented.

The signal to allies is more complicated. European and Canadian partners have at various points expressed frustration with the extraterritorial reach of American secondary sanctions, even while broadly supporting the objectives those sanctions pursue. A Cuban opening that looks like a reward for endurance might accelerate existing grievances among partners who have maintained sanctions solidarity at some cost to their own commercial interests. The structural logic of dollar dominance is that it creates winners and losers within the Western alliance as well as between Washington and its targets.

The Road Not Taken

The Polymarket odds at one-in-four remain the most honest representation of where things stand. Negotiations between estranged powers rarely follow linear trajectories, and the domestic political constraints on both sides — Cuban hardliners protecting economic privileges tied to scarcity, American politicians navigating a Florida electorate shaped by the 1960s diaspora — create friction that can end a process at any point. The sources do not specify what triggered the current round of engagement, and no public record of the negotiating sessions has been published.

What the sources do establish is that Iranian state media is watching, and that Tehran drew its own conclusions from American openness toward Cuba. The denunciation of American interference in Cuban affairs, as reported by Iranian state media on 23 May, is simultaneously a statement about Cuba and a message about Iran: Tehran wants Washington to know that its actions are monitored, and that alternative framings of American policy exist in circulation. That kind of monitoring is routine in diplomatic practice, but its explicit character in this instance suggests that Iran is looking for evidence that the rules of engagement are shifting in ways that might eventually apply to its own case.

The dollar's role as a tool of foreign policy remains intact. What appears to be changing — tentatively, and still subject to reversal — is the assumption that the tool will be deployed in exactly the same way toward exactly the same targets indefinitely. That shift is small by most measures. A one-in-four probability of a Cuba deal by the end of June is not a transformation. But in a geopolitics defined by slow erosion of established orders, small shifts in the assumptions that govern policy are often the leading indicators of larger ones.

This publication covered the Cuba negotiations as a dollar-hegemony story rather than a human-rights-vs-regime-change narrative. The Polymarket odds were used as reported gauges of market sentiment, not as predictive data. Iranian state media framing of the US move was included because it represents a legitimate diplomatic counter-position that mainstream coverage of the Cuba opening has largely omitted.

Wire provenance

This editorial synthesis draws on the following public wire/social posts:

• https://t.me/Irna_en/
• http://reut.rs/49k4hYJ
• https://t.me/Irna_en/
• http://reut.rs/49k4hYJ