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On Monday, at landmark merit hearings held at the International Court of Justice (ICJ) over the decades-long Essequibo Region territorial dispute, legal representatives for Guyana delivered a sweeping rebuttal of Venezuela’s core foundational claim, dismantling a decades-old document that has underpinned Caracas’ territorial assertion for more than half a century. The long-simmering dispute centers on the 1899 Arbitration Tribunal boundary award, which granted Guyana sovereignty over the 159,000-square-kilometer Essequibo Region rich in oil and mineral resources. Venezuela has contested the award’s validity since 1962, relying on a posthumously released memorandum written by Severo Mallet-Prevost, former secretary to the 1899 tribunal. The document alleges the final award was the product of backroom collusion between the United Kingdom and Imperial Russia, engineered through pressure from tribunal president Friedrich Martens.

Appearing before the ICJ in The Hague, prominent international law professor Philippe Sands, lead counsel for Guyana, dismissed the Mallet-Prevost memorandum as a baseless, unsubstantiated compilation of unreliable anecdotes. The memo was privately circulated after Mallet-Prevost’s death in 1948, and transferred to the Venezuelan government by American jurist Otto Schoenrich in 1949, laying the groundwork for Caracas to revive its territorial claim. Sands told the full bench of the ICJ that for more than 60 years, Venezuela has weaponized the memorandum to create unsubstantiated controversy, rather than illuminate the factual record of the 1899 award.

Sands characterized the core allegation of a secret Anglo-Russian power-sharing deal as outlandish, noting the document’s overwhelming reliance on speculation and total lack of verifiable fact. Long on fantasy and short on empirical evidence, the memorandum lay dormant for 13 years after it was first published, he added. No credible independent evidence exists to confirm the off-the-record conversations Mallet-Prevost described, and nothing in the document supports Venezuela’s claim that the 1899 award is legally void, Sands argued. Describing the memorandum as a “giant red herring,” he told the court that the document does nothing to validate Venezuela’s challenge to the 1899 award, and instead only confirms that the entire challenge is rooted in fiction rather than fact.

Sands also questioned the document’s provenance, noting it was published nearly half a century after the conversations it claims to document, and that Mallet-Prevost was a known, publicly recognized advocate for Venezuela’s territorial claims. “Venezuela has opened a world of theater and fiction, not law, not fact,” Sands told the court. “This is the stuff of a novel. It is not the stuff of a pleading before this court.” Photographs from the hearing showed Venezuela’s delegation, led by Foreign Minister Yvan Gil, listening to Sands’ rebuttal without interruption.

In addition to dismantling Venezuela’s core evidentiary claim, Guyana’s legal team has also asked the ICJ to impose formal consequences on Venezuela for violating two earlier provisional measures orders issued by the court. In December 2023, Venezuela held a national referendum that approved constitutional amendments to formally claim Essequibo as Venezuelan territory, established new administrative districts for the region, moved to register local residents to vote in Venezuelan national elections, and designated the area a national defense zone. All of these actions directly violated the ICJ’s prior orders requiring Venezuela to refrain from altering the status quo of the disputed region, Guyana argues.

Edward Craven, another member of Guyana’s legal team, told the court that Venezuela’s actions represented a clear, intentional violation of the ICJ’s binding provisional measures. Craven requested that the ICJ issue a formal declaration that Venezuela violated the court’s orders, and compel Caracas to revoke all domestic laws, executive decrees and administrative actions that purport to incorporate Essequibo into Venezuelan territory, and extend Venezuelan legislative, executive and judicial jurisdiction over the region. Guyana is also demanding that Venezuela withdraw and destroy all official maps that incorrectly depict Essequibo as part of Venezuelan territory. “These measures are requested because Venezuela is under the obligation, by way of reparation for its breaches of the provisional measures, to re-establish the situation which would in all probability have existed if those breaches had not been committed,” Craven told the court.

Venezuela is scheduled to present its oral arguments on the merits of the territorial dispute before the ICJ on Wednesday. The hearing marks a key milestone in a dispute that has raised regional tensions over the past two years, following the discovery of massive new oil reserves in the Essequibo offshore shelf that have turned Guyana into one of the world’s fastest-growing oil producers.

On Monday, 4 May 2026, oral proceedings on the merits of the long-running Guyana-Venezuela border dispute kicked off at the International Court of Justice (ICJ), with Guyana formally dismissing decades of Venezuelan claims alleging procedural irregularity and foul play in the 1899 territorial settlement that granted Guyana control over the resource-rich Essequibo Region.

Venezuela’s core challenges to the dispute’s legal framework center on two key documents: the 1897 Treaty of Arbitration between Caracas and the United Kingdom, which established the process to resolve the boundary conflict, and the 1899 Arbitral Tribunal Award that allocated the Essequibo territory to what would later become Guyana. Caracas claims the 1897 deal was negotiated without its full consent, included coercive pressure, and contained procedural flaws that ultimately led to an unjust 1899 ruling that stripped Venezuela of the territory.

Appearing before the ICJ panel of judges on Guyana’s behalf, lead counsel Paul Reichler systematically refuted every one of Venezuela’s allegations, backing his arguments with declassified contemporary correspondence between Venezuela, the United Kingdom and the United States. Reichler emphasized that Venezuela has no legitimate legal or factual basis to invalidate either the 1897 Treaty or the 1899 arbitral award.

Reichler also outlined the long history of the dispute, noting that Venezuela publicly accepted, respected and abided by the 1899 award for more than 60 years before formally challenging its validity in a 1962 letter to the United Nations Secretary-General. Crucially, Reichler added, even when Venezuela reversed its position on the 1899 award, it continued to recognize the 1897 Treaty as a binding legal agreement in subsequent UN submissions – a contradiction that undermines its current challenge to the treaty’s validity.

Reichler dismissed Venezuelan claims that the United States colluded with the United Kingdom to advance British interests at Venezuela’s expense. He pointed to surviving contemporary documentary evidence that directly contradicts allegations that the 1897 treaty was negotiated behind Venezuela’s back, without input from Venezuelan representatives, or that it ignored Caracas’ core interests. He confirmed that the final text of the 1897 Treaty fully incorporated Venezuela’s position on both the legal principle of prescription and the continuing validity of the 1850 bilateral agreement, and that contemporary records show Venezuela explicitly agreed that the United States had properly protected its interests during negotiations.

Another key Venezuelan claim is that the 1897 Treaty was reached without its full consent and barred it from appointing its own arbitrator to the tribunal. Reichler labeled this argument as entirely groundless, citing archival records showing the draft treaty shared with Caracas in November 1896 explicitly addressed arbitrator appointments. Under Article Two of the final treaty, the five-member tribunal would have two members nominated by the U.S. Supreme Court, two by the British High Court of Justice, and a fifth appointed by the four nominees. The structure left open the explicit possibility that U.S. justices would nominate a Venezuelan candidate – a provision that British negotiators openly opposed, Reichler confirmed.

On Venezuela’s argument that the 1897 Treaty was signed under coercion, a violation of Article 52 of the 1969 Vienna Convention on the Law of Treaties, Reichler noted that the convention’s provisions do not apply retroactively to agreements concluded decades before the treaty entered into force. He also rejected Venezuela’s claims that the alleged Anglo-American conspiracy amounts to fraud under Article 49 of the convention, as well as claims that Venezuela ratified the 1897 Treaty under a mistake of fact, as defined in Article 48, after being told the agreement protected its interests only to see those interests sidelined during the 1899 arbitration.

Reichler confirmed that while the 1897 arbitration agreement was primarily negotiated directly by then-British Ambassador to the U.S. Lord Pauncefote and U.S. Secretary of State Richard Olney on Venezuela’s behalf, Caracas raised no objections to the negotiation process at the time.

Guyana’s full delegation to the ICJ hearing includes Foreign Minister Hugh Todd, Attorney General Anil Nandlall, Guyana’s Agent to the ICJ Carl Greenidge, and Donnette Streete, Director of Frontiers at the Guyanese Ministry of Foreign Affairs. The ICJ’s merits hearing will now proceed, with Venezuela expected to present its own arguments in the coming days, as the court works to resolve a territorial conflict that has lingered for more than a century.