The U.S. Supreme Court ruled 6-3 on Tuesday that Exxon Mobil can press its lawsuit against a Cuban state-owned conglomerate over oil and gas assets seized by Fidel Castro's government more than six decades ago, a decision that strips Cuban entities of a key legal shield and opens the door to claims potentially worth billions of dollars.
The ruling, authored by Justice Brett Kavanaugh and joined by the Court's five other conservative members, reverses a lower court's 2024 finding that Corporación CIMEX, Cuba's largest state-owned conglomerate, could invoke sovereign immunity under the Foreign Sovereign Immunities Act of 1976. The case now returns to a lower court for further proceedings on CIMEX's liability.
At its core, the dispute reaches back to 1959, when Castro's revolutionary government confiscated a refinery and service stations belonging to Standard Oil, Exxon's corporate predecessor. That seizure was valued at roughly $70 million at the time. With interest and the potential for enhanced damages, Exxon's claim now exceeds $1 billion.
The legal vehicle is the Helms-Burton Act, the 30-year-old federal law Congress passed in 1996. Title III of the statute permits lawsuits in U.S. courts against anyone who "traffics" in property confiscated by Cuba's communist government after the revolution. But for more than two decades, three successive presidents suspended that provision on national security grounds, largely to avoid diplomatic friction with allies, including Canada and Spain, whose companies had invested in Cuba.
That changed in 2019, when the suspension was lifted during the first Trump term. Exxon filed suit that same year. Roughly 40 other cases followed in 2019 and 2020.
CIMEX fought back with a straightforward defense: as an arm of the Cuban state, it claimed immunity under the 1976 Foreign Sovereign Immunities Act. A lower court agreed in 2024. The Supreme Court did not.
Justice Kavanaugh, writing for the majority, framed the question in practical terms. As the Washington Times reported, Kavanaugh wrote that it "would make little sense" if the law allowed the president to decide whether suits could proceed against Cuban interests while simultaneously shielding those same interests with sovereign immunity.
"The Helms-Burton Act authorizes private suits against Cuban agencies and instrumentalities, suits that would largely be nonstarters if subjected to the FSIA's requirements."
In other words, Congress designed the statute to let Americans recover stolen property. Letting Cuba's government hide behind a different federal law would gut the entire purpose.
Justice Elena Kagan dissented, joined by the Court's two other liberal members. Her objection was textual: Congress, she argued, never explicitly revoked sovereign immunity in the Helms-Burton Act, and such a revocation demands unmistakable clarity.
"Nothing in the text or 'architecture' of the Helms-Burton Act suggests that Congress abrogated the sovereign immunity of these defendants, much less that it did so with the requisite unmistakable clarity."
The dissent treats sovereign immunity as a default that Congress must override with surgical precision. The majority treated it as an obstacle Congress plainly intended to remove, even if the statute didn't spell it out in neon letters.
The 6-3 split fell along the Court's familiar ideological lines. The conservative majority has delivered a string of consequential rulings this term, including a recent decision backing the Trump administration's authority over green card holders accused of crimes.
The history behind this case is worth understanding. After Castro seized power in 1959, his government systematically confiscated American-owned property across Cuba, refineries, farms, factories, hotels. U.S. companies lost assets worth hundreds of millions of dollars. For decades, those losses went uncompensated.
Congress passed the Helms-Burton Act in 1996, partly in response to Cuba's shootdown of civilian aircraft that year. The law was supposed to create a legal mechanism for recovery. But successive administrations kept Title III on ice, worried about angering allies and complicating diplomacy.
The result was a law that existed on paper but did nothing in practice for 23 years. When the suspension was finally lifted in 2019, companies like Exxon moved quickly. CIMEX, which Exxon accuses of continuing to hold and profit from the confiscated refinery and service stations, became the primary target.
The broader stakes are significant. The Washington Times noted that nearly 6,000 individuals and businesses hold additional claims worth $1.9 billion before interest, all of which could be affected by Tuesday's ruling. The Supreme Court's current term has already produced several rulings with major policy consequences, and this one may prove among the most far-reaching.
Tuesday's decision lands at a moment when U.S. policy toward Cuba has hardened considerably. The U.S. has threatened sanctions on countries supplying Cuba with fuel, triggering power outages on the island. Last month, the government brought murder charges against former Cuban President Raúl Castro, now 94, Fidel's younger brother.
The Trump administration supported Exxon's appeal to the Supreme Court, signaling that the executive branch sees the Helms-Burton Act not just as a legal tool but as a pressure point against the Cuban regime.
For Cuba's government, the ruling creates a practical problem that sovereign immunity had previously kept at bay. CIMEX and other state-owned entities now face the prospect of defending themselves in U.S. courts, courts where they hold no assets and enjoy little sympathy. The approximately 40 other cases filed under the Helms-Burton Act in 2019 and 2020 may now proceed on firmer legal ground.
The Court's willingness to strip sovereign immunity from Cuban instrumentalities also raises questions about how aggressively claimants will pursue enforcement. A judgment against CIMEX is one thing. Collecting on it is another, though the ruling itself removes a major obstacle that had blocked Exxon's case from even reaching the merits.
This term has seen the Court act decisively across a range of issues, from gun rights to criminal law. The Exxon ruling fits a pattern: a conservative majority willing to enforce the plain implications of federal statutes, even when doing so creates diplomatic discomfort.
The case now returns to a lower court, where CIMEX's actual liability will be litigated. The timeline for those proceedings remains unclear. But the legal framework is no longer in dispute: Cuban state-owned firms cannot hide behind sovereign immunity when Americans come to collect on confiscated property.
Whether Exxon ultimately recovers its billion-dollar-plus claim depends on what the lower court finds, and on whether any Cuban assets can be reached. But the principle established Tuesday is straightforward. When Congress passed the Helms-Burton Act, it meant what it said. And the Court, after three decades, has finally confirmed it.
The Court's recent willingness to enforce statutes as written, rather than as diplomats might prefer, has been one of the defining features of this term. The Exxon ruling is the latest example.
For sixty-six years, Cuba's communist government profited from stolen American property and dared anyone to do something about it. On Tuesday, six justices accepted the dare.
