In late May 2026, Iran’s Islamic Revolutionary Guard Corps Navy moved submarines and fast-attack boats into the Gulf of Oman to participate in joint naval exercises alongside Russian and Chinese warships, according to dispatches from Iranian state media and Associated Press reporting on recent IRGC drills in the region. The deployment places Iranian assets in waters routinely patrolled by U.S. carrier strike groups, at a moment when tensions across the Middle East remain elevated following Iran’s brief but intense war with Israel.
The exercises mark the latest iteration of the “Maritime Security Belt” series, a trilateral drill format that Iran, Russia, and China have conducted periodically since 2019. But the timing and location of this round carry sharper significance than previous editions. The IRGC, which normally controls naval operations inside the Persian Gulf and the Strait of Hormuz, pushed assets beyond its traditional zone into the Gulf of Oman, waters that typically fall under the jurisdiction of Iran’s regular national navy.
What the drills involved
During a recent exercise near the Strait of Hormuz, the IRGC launched ballistic and cruise missiles in the Sea of Oman, demonstrating the weapons Tehran would rely on to threaten warships and tankers transiting the narrow chokepoint. Roughly 21 percent of global petroleum liquids passed through the Strait of Hormuz daily in 2023, according to the U.S. Energy Information Administration, making it the single most important oil transit point on Earth.
Separately, Iran’s regular navy ran missile-launch exercises in the Gulf of Oman and the Indian Ocean, its first publicized drill since the 12-day conflict with Israel. Tehran has a long pattern of staging naval shows of force after absorbing military setbacks, and extending those exercises into the Indian Ocean signals an effort to project operational reach well beyond the Strait.
The IRGC’s contribution to the trilateral drills centers on the asymmetric tools it has spent decades refining: swarms of small, fast boats designed to overwhelm larger warships, and midget submarines built for shallow-water ambush and mine-laying in confined seas. Russia has historically contributed surface combatants to these exercises, while China has provided support vessels and communications infrastructure. Previous iterations of the Maritime Security Belt drills in 2022 and 2024 followed a similar pattern, though none coincided with this level of post-conflict tension.
What remains unconfirmed
Key details about the current exercises have not been independently verified. No official Iranian, Russian, or Chinese statement available at the time of reporting specifies the exact number of submarines or fast boats deployed, the command arrangements governing trilateral operations, or the rules of engagement for interactions with U.S. forces.
That gap matters. There is a significant difference between genuine interoperability, where ships from different navies share targeting data and coordinate maneuvers in real time, and parallel exercises conducted in the same general area for the cameras. Without confirmed details on shared command structures or joint tasking, analysts cannot determine which category these drills fall into.
Precise positions relative to U.S. carrier groups also remain unconfirmed by publicly available geospatial data or official navigation logs. The Gulf of Oman is large enough to accommodate multiple naval forces without direct contact. Any military activity there falls within the published operating radius of carrier-based aircraft and cruise missiles, so the “within range” framing is geographically accurate. But proximity on a map is not the same as a close encounter at sea, and no verified tracking data has surfaced showing Iranian submarines or fast boats operating at distances that would trigger U.S. defensive protocols.
Iran’s claims about missile performance during the drills also deserve scrutiny. Tehran has a documented history of overstating weapons capabilities during exercises. Without third-party tracking data, the actual range, accuracy, and reliability of the missiles launched cannot be confirmed with precision.
The strategic signal and its limits
Even with those caveats, the political message is hard to miss. By staging drills with Russian and Chinese warships in the Gulf of Oman, Tehran frames its naval posture not as unilateral brinkmanship but as part of a broader coalition pushing back against what all three governments describe as Western maritime hegemony.
“These exercises are designed to signal that Iran is not isolated, that it has partners willing to stand beside it in waters the U.S. Navy considers its backyard,” said Afshon Ostovar, an associate professor at the Naval Postgraduate School and author of Vanguard of the Imam: Religion, Politics, and Iran’s Revolutionary Guards, in previous analysis of Iran-Russia-China naval cooperation.
Yet the depth of that partnership should not be overstated. Russia and China have participated in joint drills with Iran multiple times without converting that cooperation into a binding military alliance or mutual defense pact. Moscow and Beijing have their own reasons for showing the flag in the Gulf of Oman, from signaling displeasure with U.S. sanctions policy to gathering intelligence on American carrier operations, that do not require them to back Iran in a shooting war.
U.S. Central Command, which oversees military operations in the Middle East through the Bahrain-based Fifth Fleet, has not publicly commented on the trilateral exercises at the time of this reporting. The United States currently maintains a carrier strike group presence in the region, though the Pentagon does not routinely disclose precise locations of its carriers.
What commercial shipping is watching
For tanker operators and energy traders, the practical consequence is familiar but unwelcome: elevated risk in waters that already carry some of the highest maritime insurance premiums in the world. Any uptick in Iranian military activity near the Strait of Hormuz and the Gulf of Oman can trigger higher war-risk surcharges, rerouting of vessels, and short-term volatility in crude prices, even without a direct clash.
Lloyd’s Market Association Joint War Committee, which sets the boundaries of high-risk zones for maritime insurance, already lists the Persian Gulf, Strait of Hormuz, Gulf of Oman, and parts of the Arabian Sea as listed areas. Trilateral military exercises in those waters give underwriters fresh reason to reassess premiums, particularly for tankers transiting without naval escort.
No confirmed reporting indicates that Iran, Russia, or China intends to disrupt commercial traffic during the current drills. But the mere presence of IRGC fast boats and submarines in shipping lanes where supertankers have limited room to maneuver creates a margin of risk that markets price in quickly.
Where this fits in a wider pattern
The Gulf of Oman drills do not exist in isolation. They follow a sequence of Iranian military actions, from the war with Israel to expanded missile testing to the IRGC’s push beyond its traditional operating zone, that collectively suggest Tehran is recalibrating its naval posture for a more confrontational era. Adding Russian and Chinese participation amplifies the signal without necessarily deepening the substance of military cooperation.
The verified facts are these: Iran has conducted aggressive naval exercises in strategically sensitive waters, fired missiles during those drills, and done so with visible backing from two of the world’s other major military powers. The unverified layer, involving the precise degree of trilateral coordination, the proximity to U.S. carriers, and the intent behind the timing, remains opaque. Both layers matter, and any serious assessment of these exercises has to account for the distance between what has been confirmed and what has been inferred.
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*This article was researched with the help of AI, with human editors creating the final content.
