Iran’s Submarine Strategy Raises Stakes as Trump Faces Growing Pressure and U.S. Fears a China Opening

WASHINGTON — The military confrontation between the United States and Iran is entering an increasingly dangerous phase, with Tehran leaning on submarines, missiles and attacks around the Strait of Hormuz while Washington faces a broader strategic concern: whether the prolonged conflict is draining resources that could be needed to deter China in the Pacific.

Iran has deployed light submarines around the Strait of Hormuz as part of an effort to strengthen its control over one of the world’s most important maritime chokepoints. Iranian military officials have described the small vessels as particularly suited for the shallow waters of the Persian Gulf, where their size and ability to operate covertly could pose a serious threat to larger surface ships.

The deployment adds another layer of uncertainty to a conflict that has already disrupted commercial shipping, driven military escalation across the Gulf and forced the United States to commit substantial naval, air-defense and precision-strike resources to the region.

For President Donald Trump, the challenge is no longer limited to Iran.

Washington is increasingly having to consider how an extended Middle East war could affect America's ability to respond to China, particularly if Beijing chooses to increase military pressure around Taiwan while U.S. forces and weapons remain heavily committed elsewhere.

Iran Turns to a Dangerous Underwater Threat

Iran's submarine fleet is uniquely suited to the geography of the Persian Gulf.

Unlike the large nuclear-powered submarines operated by the United States, Iran relies heavily on smaller vessels, particularly the Ghadir-class mini-submarine. These boats are designed to operate in shallow coastal waters, conduct reconnaissance, deploy mines and attack enemy ships with torpedoes.

Their relatively small size makes them difficult to detect in the narrow and acoustically complicated waters surrounding the Strait of Hormuz.

Iran has previously warned that its light submarines could be deployed throughout the strait against hostile naval vessels. Reports in May indicated that Iranian commanders had begun moving these submarines into the strategic waterway as tensions with Washington intensified.

The strategic importance of the Strait of Hormuz makes even a limited submarine threat significant. The waterway remains one of the most critical routes for global energy supplies, meaning attacks or even credible threats against commercial vessels can have immediate international economic consequences.

U.S. Strikes Iran’s Submarine Infrastructure

Washington has already responded aggressively to Iran's naval capabilities.

On July 12, U.S. Central Command carried out a highly unusual attack against Iran's Bandar Abbas Naval Base using three Corsair unmanned surface vessels.

According to CENTCOM, the one-way attack sea drones targeted a submarine and ship-maintenance facility. The operation marked the first publicly acknowledged combat use of American sea drones.

Video released by the U.S. military showed the unmanned boats approaching the facility before explosions erupted near a dock where what appeared to be a Ghadir-class mini-submarine was positioned.

CENTCOM said the attack was intended to degrade Iran's ability to continue threatening commercial shipping.

The operation highlighted how rapidly the naval conflict is evolving. Instead of relying exclusively on warships, aircraft and cruise missiles, the United States is now using inexpensive unmanned vessels to attack maritime targets.

But the strike also demonstrated that Washington continues to view Iran's submarine force as a potential threat.

The Battle for Hormuz Intensifies

The fighting has continued well beyond the submarine strike.

By July 24, U.S. and Iranian forces were again exchanging attacks after nearly two weeks of renewed escalation.

Iran targeted areas hosting American forces around the Persian Gulf, while U.S. forces continued striking Iranian military installations. The U.S. military also said it disabled a merchant vessel after accusing its crew of repeatedly attempting to breach Washington's blockade of Iranian ports.

Iran's Revolutionary Guard simultaneously warned civilians in countries hosting American forces to stay away from U.S. military positions.

The message suggested Tehran was willing to continue expanding the geographical pressure on Washington even as diplomatic contacts remained underway.

President Trump, meanwhile, has alternated between threats of further military action and suggestions that negotiations could still produce an agreement.

On July 24, Trump repeatedly emphasized that American representatives were communicating with Iran, describing the talks as unusually serious while leaving open the possibility of further escalation.

That combination — negotiations occurring alongside daily military strikes — illustrates the increasingly unstable position confronting both governments.

Trump Warns China and Russia

China and Russia have also moved closer to the center of the crisis.

Trump said on July 24 that he did not believe either country was directly supplying weapons to Iran.

He said Chinese President Xi Jinping had previously assured him that China would not provide weapons to Tehran and that Russian President Vladimir Putin had offered a similar assurance.

But Trump also issued a warning.

If China or Russia became directly involved in assisting Iran, he said, the consequences would be “very bad for them.”

The remarks showed how quickly the Iran conflict could become entangled with America's broader competition with other major powers.

Iranian officials, meanwhile, have continued communicating with Beijing and Moscow. China has also participated in diplomatic efforts aimed at finding a possible pathway back to U.S.-Iran negotiations.

Yet Washington's biggest concern about China may not be Chinese weapons arriving in Iran.

The more serious strategic question is whether Beijing benefits simply by watching the United States consume resources in another prolonged Middle Eastern conflict.

America’s Weapons Stockpile Becomes a Critical Concern

Months of fighting have put significant pressure on some of America's most important weapons inventories.

The rapid consumption of advanced air-defense interceptors and precision-guided weapons has caused concern inside the Trump administration, according to U.S. military and intelligence officials cited by CBS News.

Officials are reportedly balancing the immediate requirement to defend forces and allies in the Middle East against the need to preserve weapons for other possible conflicts — particularly in the Indo-Pacific.

A separate analysis by the Center for Strategic and International Studies found that replacing some advanced weapons consumed during the Iran war could take years.

Among the systems under pressure are Tomahawk cruise missiles and Patriot and THAAD missile interceptors — weapons that could also be crucial during a major confrontation in the Pacific.

This is where the China question becomes particularly serious.

Money alone cannot immediately solve the problem. Advanced missiles require specialized factories, components, trained workers and complex supply chains. Production capacity cannot be expanded overnight.

If large quantities continue to be used against Iran, rebuilding inventories could remain a challenge long after the Middle East fighting stops.

Could China Exploit the Distraction?

American allies in Asia have already been asking that question.

Taiwan, Japan and South Korea have expressed concern that an extended U.S. military commitment in the Middle East could reduce Washington's ability to concentrate forces and weapons in the Indo-Pacific.

Reuters previously reported that Asian officials and analysts feared China could exploit the distraction by increasing pressure around Taiwan or elsewhere in the region.

Taiwan has been particularly attentive to Chinese military activity.

Beijing has continued sending military aircraft and ships around the island, while Taiwanese officials worry that China could use America's involvement with Iran to test Washington's ability to respond to simultaneous crises.

That does not mean a Chinese attack is imminent.

There is currently no confirmed evidence that Beijing has decided to launch a military operation against Taiwan because of the Iran conflict.

But the strategic opportunity is difficult to ignore.

A confidential U.S. intelligence assessment previously reported by The Washington Post concluded that China had gained advantages from America's involvement in the Iran war across military, diplomatic, economic and information domains.

The assessment also highlighted pressure on American weapons inventories and concerns among U.S. allies about Washington's ability to manage multiple major confrontations simultaneously.

A Two-Front Strategic Nightmare

The central problem facing Washington can therefore be summarized in one question:

How long can the United States sustain an intense war against Iran without weakening its deterrence against China?

America remains militarily far more powerful than Iran, and the Pentagon maintains that U.S. forces are capable of responding to threats around the world.

But military readiness is not simply determined by the number of ships, aircraft or troops available.

Missile inventories matter.

Maintenance schedules matter.

Industrial production matters.

And geography matters.

Every interceptor fired in the Middle East is an interceptor that must eventually be replaced. Every naval vessel committed to the Persian Gulf is a vessel unavailable somewhere else during that deployment.

For China, this creates an opportunity even without firing a shot.

Beijing can observe American tactics, monitor weapons consumption, increase political and military pressure around Taiwan and force Washington to demonstrate that it can defend its interests in two regions at once.

Submarines Add Another Layer of Risk

Iran's submarine strategy makes that calculation even more complicated.

Small Iranian submarines do not need to defeat the entire U.S. Navy to have strategic value.

Their purpose can simply be to make naval operations more dangerous, force American ships to devote additional resources to anti-submarine warfare and increase the cost of maintaining control over the Strait of Hormuz.

The U.S. strike on the submarine facility at Bandar Abbas demonstrates that Washington recognizes this threat.

But destroying individual submarines or naval installations does not automatically eliminate Iran's broader ability to threaten shipping.

Commercial traffic through Hormuz has remained significantly below normal levels during the fighting, illustrating how military risk alone can disrupt one of the world's most important maritime corridors.

Trump Faces a Critical Decision

Trump now confronts a strategic dilemma.

Escalating the campaign could further damage Iran's military capabilities and potentially increase pressure on Tehran to accept Washington's conditions.

But escalation also means using more missiles, deploying more forces and extending America's commitment to a war that is already affecting calculations far beyond the Middle East.

Reducing military operations could preserve U.S. resources and allow Washington to refocus on the Indo-Pacific — but it could also give Iran an opportunity to rebuild its position and claim that it resisted American pressure.

The submarine threat in Hormuz is therefore only one piece of a much larger confrontation.

Behind the fighting between Washington and Tehran lies another strategic contest — one involving China and the future balance of power in the Pacific.