Talks stall over uranium and strait

Negotiations between the United States and Iran ended without an agreement after 21 hours of discussions, exposing deep divisions over nuclear policy, control of the Strait of Hormuz and regional security, while Washington signalled it may escalate pressure through a naval blockade.

The talks, which began on April 11 with Pakistan acting as mediator, were described by officials as intensive but inconclusive, with both sides acknowledging that key disagreements remain unresolved. Iranian representatives rejected what they described as excessive U.S. demands, particularly regarding the transfer of enriched uranium and restrictions on Tehran’s influence over the strategically important waterway.

According to sources cited by Western media, disputes centred on Iran’s insistence on maintaining control over the Strait of Hormuz and its refusal to hand over stockpiles of enriched uranium — issues Washington considers critical for preventing nuclear proliferation.

A spokesperson for Iran’s foreign ministry said the failure to reach an agreement was not unexpected, noting that “two or three key issues” remain unresolved, and stressing that diplomacy will continue through contacts with regional partners.

Despite the lack of a breakthrough, officials from Pakistan and other mediators described the talks as a constructive first step that helped revive diplomatic engagement after weeks of escalating tensions.

Blockade signals shift from diplomacy to coercion

Shortly after the talks concluded, U.S. President Donald Trump said Washington would move toward a naval blockade of vessels entering and leaving the Strait of Hormuz, a key chokepoint for global oil flows. He warned that U.S. forces would intercept ships that had paid transit fees to Iran and indicated that allied countries could join the effort.

Trump also said U.S. naval forces would begin mine-clearing operations in the strait and warned that any Iranian attacks on U.S. or civilian vessels would be met with force.

These statements mark a significant escalation in U.S. strategy, shifting from negotiations to economic and military pressure aimed at undermining Iran’s leverage in global energy markets. Analysts say such a blockade, if implemented, could disrupt oil supplies and increase volatility in already fragile markets.

According to military analysts, the United States has already deployed a significant naval presence in the Persian Gulf, including carrier strike groups, giving it the operational capacity to enforce maritime restrictions.

Nuclear dispute remains key obstacle

Washington continues to insist that Iran must relinquish its enriched uranium stockpiles and accept strict limits on its nuclear programme. Tehran, however, maintains that it has the right to peaceful nuclear energy and denies seeking nuclear weapons.

Iranian officials have shown some willingness to consider confidence-building measures, including potential limits on uranium enrichment levels, but rejected demands they see as undermining national sovereignty.

This gap reflects a broader structural deadlock: the United States seeks irreversible constraints on Iran’s nuclear capabilities, while Tehran aims to preserve strategic autonomy while easing sanctions pressure.

Regional dimension complicates diplomacy

The talks also intersect with broader regional conflicts, including Israel’s military operations in Lebanon and Iran’s support for Hezbollah. Iran’s reported proposals included a halt to Israeli strikes, a condition rejected by Israel, which argues its operations fall outside any U.S.-Iran ceasefire framework.

Israeli Prime Minister Benjamin Netanyahu’s visit to southern Lebanon and preparations for separate Israel-Lebanon talks in Washington highlight the fragmented nature of diplomacy in the region, where multiple conflict tracks are unfolding simultaneously.

Russia has positioned itself as a potential mediator, with President Vladimir Putin reaffirming readiness to support a political settlement in talks with Iranian President Masoud Pezeshkian, underscoring the growing role of external powers.

Escalation risks remain high

While both sides left the door open for further dialogue, the combination of unresolved core disputes and escalating military signalling points to a fragile outlook.

Analysts say the immediate risk lies in miscalculation in the Persian Gulf, where increased naval activity and competing claims over the Strait of Hormuz could trigger direct confrontation.

At the same time, the willingness of mediators to continue facilitating talks suggests that neither Washington nor Tehran has fully abandoned diplomacy.

For now, the outcome of the Islamabad talks reflects a familiar pattern: gradual engagement overshadowed by strategic mistrust and an increasing reliance on pressure tactics that could reshape the balance of risk in the Middle East.