The report said any action would likely fall short of a full-scale invasion, instead involving special operations forces and conventional infantry targeting locations such as Kharg Island and coastal areas near the Strait of Hormuz, a critical corridor for global oil shipments.

Washington has already moved thousands of Marines to the Middle East amid the month-long conflict. The first of two contingents arrived on an amphibious assault ship on Friday, according to the U.S. military.

Additional deployments under consideration include forces from the 82nd Airborne Division, alongside approximately 5,000 Marines being repositioned to the region. These reinforcements would add to an estimated 50,000 U.S. troops already stationed across the Middle East, according to media reports.

U.S. Secretary of State Marco Rubio said Washington could achieve its objectives without deploying ground troops but noted that forces were being positioned to give policymakers “maximum” flexibility.

Defense analysts cited in reports said limited operations could aim to secure maritime routes or seize key infrastructure such as Kharg Island, a major hub for Iran’s oil exports.

Military experts have cautioned that even limited ground incursions could lead to prolonged engagement, raising the risk of a broader conflict and increased casualties.

Concerns also persist over the economic implications of instability around the Strait of Hormuz, through which a significant share of global energy supplies passes.

No final decision on ground operations has been announced, and U.S. officials have not publicly confirmed the scope or timing of any potential action.

Trump told reporters at the White House that U.S. officials were engaged with “the right people” in Iran and suggested Tehran was eager to reach an agreement.

A source familiar with the matter confirmed that Washington had transmitted a multi-point proposal aimed at halting the conflict, now in its fourth week following U.S. and Israeli strikes launched on February 28.Iranian authorities denied that direct negotiations were underway.

Parliament Speaker Mohammad Baqer Qalibaf dismissed reports of talks as “fake news,” underscoring persistent gaps between public positions and diplomatic signals.

According to media reports cited by regional outlets, the U.S. proposal includes provisions for dismantling Iran’s nuclear program, ending support for proxy groups, and reopening the Strait of Hormuz. A month-long ceasefire has also been discussed to facilitate negotiations, though no official confirmation of those terms has been issued by Washington.

Trump said Iran had made a “valuable concession” linked to non-nuclear energy and maritime transit through the Strait of Hormuz, a critical chokepoint through which roughly 20% of global oil supply typically flows. He did not provide details.

Iran informed the United Nations Security Council and the International Maritime Organization that non-hostile vessels could transit the strait if coordinated with Iranian authorities, according to a note seen by Reuters. The waterway has effectively been shut since the outbreak of hostilities, triggering a sharp global energy supply disruption.

Despite diplomatic signals, military activity has continued on all sides. Two sources said the United States is preparing to deploy thousands of troops from the Army’s 82nd Airborne Division to the Middle East, adding to approximately 50,000 U.S. personnel already stationed in the region.

The deployment would accelerate a broader military buildup, heightening concerns among analysts and regional actors that the conflict could become prolonged even as negotiations proceed.

Pakistan’s Prime Minister Shehbaz Sharif said his government was willing to host talks between Washington and Tehran, expressing support for dialogue aimed at achieving a comprehensive settlement.

A Pakistani government source said discussions about a potential meeting were at an advanced stage, though no agreement had been finalized.Pakistan maintains longstanding ties with Iran and has recently strengthened engagement with the United States, positioning itself as a potential intermediary.

The latest developments come a day after Trump delayed threatened strikes on Iranian power infrastructure, citing “productive” discussions, while Oman, which has acted as a mediator, previously indicated that progress had been made in earlier negotiations before the outbreak of conflict.

Trump issued the warning in a social media post on Saturday, saying Washington would “obliterate” Iranian power facilities if the strategic waterway remained closed. The strait, a critical conduit for global oil flows, has been effectively shut amid the ongoing hostilities.

Iran’s military command, Khatam al-Anbiya, said any attack on its fuel and energy infrastructure would trigger strikes on U.S. and Israeli assets, including critical civilian-linked systems.

The statement, carried by state media, underscored a widening scope of potential targets beyond conventional military sites.

Iranian officials also indicated that access through the Strait of Hormuz would be restricted, with passage permitted selectively, reflecting Tehran’s control over the route during the conflict.

The escalation coincided with renewed Iranian missile barrages on Israel, including strikes near the southern cities of Dimona and Arad, close to the Negev Desert nuclear research area.

Israeli authorities said dozens were injured and residential buildings sustained heavy damage.Israeli Prime Minister Benjamin Netanyahu said the impact in Arad caused extensive destruction but no fatalities, while urging adherence to air raid warnings. Israel’s military acknowledged that some missiles were not intercepted, marking a breach in air defence coverage in the area.

Iran’s parliament speaker Mohammad Bagher Ghalibaf said the strikes indicated a shift to a new operational phase in the conflict.

The conflict has extended beyond Iran and Israel, with Hezbollah claiming responsibility for a deadly strike in northern Israel, while Gulf states reported drone and missile activity targeting energy infrastructure.

Iran also targeted the joint UK-U.S. military facility at Diego Garcia in the Indian Ocean, though officials said the strike was unsuccessful. Military assessments cited in reports suggested the possibility of longer-range capabilities or alternative launch methods, though no confirmation was provided by Tehran.

The disruption to shipping through the Strait of Hormuz has halted most tanker traffic, contributing to supply constraints and rising global energy prices. Countries including the United Arab Emirates, Britain, Germany, France and Japan have expressed readiness to support efforts to restore safe navigation through the waterway.

U.S. Central Command said earlier that strikes on Iranian coastal facilities had degraded Tehran’s ability to target vessels in the strait. Additional U.S. naval assets and personnel are being deployed to the region as part of ongoing operations.

Casualties have mounted across multiple theatres, with Iran reporting more than 1,500 deaths, while Israel, the United States and Gulf states have also recorded military and civilian losses.

Air raid sirens sounded across Israel early on Sunday, warning of incoming Iranian missiles, after dozens of people were wounded overnight in separate attacks in the southern towns of Arad and Dimona. Israel’s military said it was carrying out strikes on Tehran hours after the Iranian attacks.

Trump on Saturday warned he would “obliterate” Iran’s power plants if Tehran did not fully reopen the Strait of Hormuz within 48 hours, marking a sharp escalation a day after suggesting the conflict could be wound down.

Iran responded on Sunday by warning it would strike U.S. infrastructure, including energy facilities in the Gulf, if Washington followed through on its threat. The warning came as U.S. Marines and heavy landing craft continued moving toward the region.

The exchange of threats has heightened fears that energy installations across key Gulf producers could become direct targets, widening the conflict beyond current theatres of engagement.

The escalating the crisis has disrupted markets, pushing fuel costs higher and intensifying concerns over global inflation. Analysts said the situation has introduced acute uncertainty into financial markets already strained by supply disruptions.

“President Trump’s threat has now placed a 48-hour ticking time bomb of elevated uncertainty over markets,” said Tony Sycamore, an analyst at IG.

He warned that failure to de-escalate could trigger sharp declines in global equities and further spikes in oil prices.

Oil prices rose on Friday to their highest levels in nearly four years after Iraq declared force majeure on oilfields operated by foreign firms, Israel struck a major Iranian gas field, and Tehran retaliated with attacks on neighbouring countries including Saudi Arabia, the United Arab Emirates, Qatar and Kuwait.

Iranian actions have effectively closed the Strait of Hormuz, a narrow passage that carries around a fifth of global oil and liquefied natural gas supplies, triggering what analysts describe as the most severe oil disruption since the 1970s.

The near-closure has also driven European gas prices sharply higher, with increases of up to 35% reported last week, reflecting the strait’s central role in global energy flows.

In a social media post late on Saturday, Trump reiterated his ultimatum, saying the United States would begin targeting Iran’s power infrastructure if the waterway was not reopened “fully” and “without threat” within the specified timeframe.