How the Iran War and Saudi Arabia’s Petrodollar Exit Are Reshaping Global Currency Power

In a quiet but seismic shift two years ago, Saudi Arabia—long the guardian of the petrodollar—effectively terminated the half-century-old agreement that tied global oil trade to the U.S. dollar. The move, undisclosed at the time, coincided with the escalation of the U.S.-Israel war on Iran, a conflict that has since exposed the fragility of America’s financial dominance. The petrodollar, which for decades underpinned the dollar’s status as the world’s premier reserve currency, now faces unprecedented erosion as oil-exporting nations diversify away from U.S. currency settlements. With China aggressively positioning its yuan as the new oil-backed alternative, economists and geopolitical analysts warn that the global monetary order is at a historic inflection point—one that could redefine trade, sanctions power, and economic sovereignty for decades to come.

What Is the Petrodollar—and Why Has It Ruled the World for 50 Years?

The petrodollar system emerged in 1974 as a direct response to the collapse of the gold standard in 1971, when President Richard Nixon severed the dollar’s link to gold. Facing a potential collapse in global demand for U.S. currency, the Nixon administration, led by Secretary of State Henry Kissinger, struck a clandestine deal with Saudi Arabia. In exchange for military protection and access to U.S. arms, the Saudis agreed to sell oil exclusively in U.S. dollars. This pact, never formally codified in a public treaty but solidified through tacit understanding and diplomatic pressure, created a self-reinforcing cycle: oil-importing nations needed dollars to buy crude, so they parked their surpluses in U.S. Treasury bonds, which in turn funded American deficits and global liquidity. Over time, the arrangement expanded to include other Gulf states—Qatar, Oman, Bahrain, and the United Arab Emirates—all of which pegged their currencies to the dollar and held vast reserves in American assets. By the 1980s, the petrodollar had cemented the dollar’s role as the backbone of international trade, with more than 80% of global oil transactions settled in dollars by the turn of the century.

The Economic Architecture That Made the Dollar Irreplaceable

At its peak, the petrodollar system generated an estimated $800 billion in required currency reserves for Gulf Cooperation Council (GCC) nations alone, as they maintained pegs to the dollar to stabilize their economies. Sovereign wealth funds across the GCC—including Saudi Arabia’s Public Investment Fund and Abu Dhabi’s Mubadala—amassed over $2 trillion in U.S. assets, from Treasuries to equities. This capital inflow allowed the U.S. to finance its trade deficits and maintain low borrowing costs, while oil exporters benefited from a stable, liquid market for their primary export. The system also gave Washington unparalleled geopolitical leverage: by controlling access to dollars, the U.S. could impose sanctions, freeze assets, and isolate adversaries like Iran, Russia, and Venezuela. But the architecture was never without vulnerabilities. Economists note that the petrodollar’s reliance on a single currency created systemic risks—any disruption to dollar liquidity, such as during the 2008 financial crisis, could trigger cascading crises in oil-exporting nations dependent on dollar-denominated revenues.

Saudi Arabia’s Silent Exit: How the Petrodollar Unraveled Starting in 2022

The first public hint that Saudi Arabia was distancing itself from the petrodollar came in March 2023, when the kingdom allowed its 2024 oil sales contracts to be settled in currencies other than the dollar—a departure from the longstanding practice of exclusively pricing oil in U.S. greenbacks. While the 1974 agreement was never a formal treaty and its terms remained shrouded in secrecy, the shift signaled a broader strategic recalibration. Analysts point to multiple drivers behind Riyadh’s move. First, China had overtaken the U.S. as Saudi Arabia’s largest oil customer in 2020, purchasing roughly 2 million barrels per day—or about 25% of the kingdom’s total exports. Second, Saudi Arabia’s Vision 2030 plan, spearheaded by Crown Prince Mohammed bin Salman, emphasized economic diversification and reduced reliance on U.S. markets. Third, the kingdom’s participation in China’s mBridge digital payment platform—a blockchain-based system enabling direct yuan-to-riyal exchanges—demonstrated a tangible commitment to reducing dollar dependence. By late 2023, Saudi Arabia and China had formalized a $7 billion currency swap agreement, further institutionalizing the shift. Though Saudi Arabia continues to conduct the majority of its oil trades in dollars, the door to yuan-denominated contracts is now ajar—a crack that could widen under sustained geopolitical pressure.

The Iran War as a Catalyst: How Geopolitical Conflict Is Accelerating De-Dollarization

The U.S.-Israeli military campaign against Iran, which intensified in early 2024, has acted as a geopolitical accelerant for the petrodollar’s decline. Iran, facing decades of U.S. sanctions and exclusion from dollar-based trade, has increasingly turned to China as its primary oil purchaser. By 2023, China accounted for 90% of Iran’s exported oil, much of it settled in yuan to evade American financial restrictions. The conflict has also disrupted the Strait of Hormuz, a critical chokepoint through which 20% of the world’s oil supply passes. Reports indicate that some tankers have been granted passage only after agreeing to settle transactions in Chinese currency—a direct challenge to the petrodollar’s monopoly. Deutsche Bank economists noted in a March 2024 client memo that the attacks on Iran could "be remembered as a key catalyst for erosion in petrodollar dominance" and the "beginnings of the petroyuan."

The Strait of Hormuz: A Chokepoint Where the Petrodollar Meets Its Match

The Strait of Hormuz is more than a geographic bottleneck; it is a financial one. Control over the strait, which links the Persian Gulf to the Gulf of Oman, grants Iran immense leverage over global oil markets. When Iran threatened to close the strait in response to Israeli strikes in 2024, the global oil price volatility underscored the petrodollar’s vulnerability. Industry insiders revealed that several shipping firms agreed to pay for passage in yuan rather than dollars to secure clearance. This marked a symbolic break from the petrodollar’s 50-year dominance. While the U.S. has pledged to reopen the strait—with former President Donald Trump threatening to "flatten" Iranian infrastructure if the channel remained closed—the episode highlighted a critical weakness: the dollar’s role in global trade is no longer unassailable. "The fact that ships are now willing to pay in yuan to pass through Hormuz is a watershed moment," said Michael Harris, an analyst at EBC Financial Group. "It shows that the petrodollar is no longer the default currency for critical global choke points."

China’s Petroyuan Strategy: Building the Yuan as the Next Global Reserve Currency

China has methodically positioned itself to capitalize on the petrodollar’s decline through a multi-pronged strategy that blends economics, technology, and geopolitics. At the heart of this effort is the Shanghai International Energy Exchange (INE), launched in 2018 as a subsidiary of the Shanghai Futures Exchange. Unlike the London and New York oil markets, which trade oil futures denominated in dollars, the INE offers contracts priced in yuan, allowing international buyers—including Russian, Iranian, and Venezuelan firms—to hedge oil purchases without exposure to U.S. sanctions or dollar fluctuations. By 2024, the INE had become the third-largest oil futures market globally, with daily volumes exceeding 1 million barrels. China’s state-owned oil companies, such as Sinopec and CNOOC, have also signed long-term supply deals with Saudi Arabia and Russia, often denominated in yuan. Beyond oil, China has invested heavily in renewable energy infrastructure, aiming to reduce its future reliance on fossil fuels—a move that aligns with its broader goal of creating a self-sustaining yuan-based trade ecosystem. "China is not just diversifying away from the dollar for geopolitical reasons," said Fadhel Kaboub, an associate professor of economics at Denison University and president of the Global Institute for Sustainable Prosperity. "It’s building the infrastructure for a future where the yuan is the primary currency of global commerce."

The Security Umbrella Gambit: Can China Replace U.S. Military Protection?

A key component of China’s strategy mirrors the U.S. playbook during the petrodollar’s rise: offering security guarantees to oil exporters. While the U.S. provided military protection to Gulf states in exchange for dollar-denominated oil sales, China has begun positioning itself as a stabilizing force in the Middle East through economic and diplomatic channels. This includes brokering the 2023 Saudi-Iran détente, which reduced tensions in the region and opened pathways for expanded yuan-based trade. Kaboub notes that China’s approach is less about imposing its military will and more about offering an alternative financial architecture. "From the perspective of Gulf countries, trading in yuan is not a geopolitical deal—it’s commonsense business," he said. "China isn’t asking for political loyalty; it’s offering a currency that isn’t weaponized through sanctions."

The Eroding Dominance of the Petrodollar: Data Shows the Shift Is Real

The signs of the petrodollar’s decline are visible in hard data. According to the International Monetary Fund (IMF), the dollar’s share of global foreign exchange reserves has fallen from 71% in 1999 to approximately 57% in 2024—the lowest level in 25 years. In the Asia-Pacific region, only about 70% of cross-border trade is invoiced in dollars, compared to over 90% in the Americas and roughly 20% in Europe. The share of oil traded outside the dollar system has also risen, with estimates suggesting that up to 25% of Gulf oil exports are now settled in non-dollar currencies. Economists at Deutsche Bank warn that if current trends continue, the petrodollar could lose its status as the exclusive currency for oil trade within a decade. "The increasing aggressiveness of the United States in imposing sanctions and waging warfare has caused more countries to question whether they want to remain tied to the dollar," said David Wight, a historian at the University of North Carolina at Greensboro. "The petrodollar is not collapsing tomorrow, but the cracks are widening."

Key Takeaways: What This Means for the Global Economy

• Saudi Arabia ended its exclusive reliance on the petrodollar in 2022, allowing oil sales to be settled in other currencies, primarily the Chinese yuan.
• The U.S.-Israel war on Iran has accelerated de-dollarization by disrupting oil trade routes and pushing nations like Iran to settle transactions in yuan to evade sanctions.
• China’s petroyuan strategy—centered on the Shanghai International Energy Exchange and currency swap agreements—is emerging as the most viable alternative to the dollar’s dominance.
• The dollar’s share of global reserves has fallen to a 25-year low of 57%, down from 71% in 1999, signaling a long-term erosion of its monopoly.
• While the petrodollar is not dead, its exclusivity is eroding, and the next decade could see a multipolar currency system where the yuan plays a central role.

Could the Petroyuan Replace the Dollar? A Reality Check from Economists

Despite the accelerating shifts, most economists caution against declaring the petrodollar obsolete. The dollar still dominates over 80% of global foreign exchange transactions and nearly all international debt issuance. The yuan, while growing, accounts for less than 3% of global reserves. Its convertibility remains restricted, and China’s capital controls limit its appeal as a reserve asset. "I’m not going to say that the petrodollar is dead—it still overwhelmingly dominates international transactions," Kaboub said. "There isn’t a thing called the petroyuan that’s a rising superpower yet. It’s a potential alternative with a long way to go." The path forward will depend on several factors: whether China can liberalize its financial system, whether oil exporters like Saudi Arabia fully embrace yuan settlements, and whether the U.S. continues to weaponize the dollar through sanctions. If the Iran war escalates further, or if other oil exporters follow Saudi Arabia’s lead, the timeline for a petroyuan-led system could shorten dramatically. Conversely, a swift U.S. victory in the conflict could restore confidence in the petrodollar—at least temporarily.

The Broader Implications: Sanctions, AI, and the Future of American Power

The petrodollar’s decline is about more than just currency—it’s a bellwether for America’s economic and geopolitical influence. The ability to impose sanctions has been a cornerstone of U.S. foreign policy since the 1970s, allowing Washington to isolate adversaries like Iran, Russia, and Venezuela by cutting them off from dollar-denominated trade. A multipolar currency system, however, would diminish this leverage. For China, the stakes are equally high: its push for yuan dominance aligns with its broader ambition to become the world’s leading high-tech and industrial power. Kaboub points to China’s dominance in solar power—with nearly four times the operational solar electricity capacity of the U.S.—as evidence of its long-term strategy. "China knows that to maintain economic dominance, it needs to control the financial architecture of the future," he said. "That means being able to impose its own currency and financial system on the rest of the world when the world is no longer as reliant on oil." Meanwhile, the U.S. faces its own vulnerabilities, including an aging energy grid and lagging investment in renewable infrastructure, which threaten its ability to compete in the next phase of global economic competition.

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