Washington and Tehran have signalled they are prepared to resume hostilities as uncertainty surrounds a second round of peace talks in Islamabad, raising concerns about a renewed escalation in the Middle East conflict.

The planned negotiations, aimed at ending weeks of fighting that have disrupted global markets, were thrown into doubt after Iran withdrew from the talks. The discussions were expected to involve senior US officials, including Vice President JD Vance, special envoy Steve Witkoff and adviser Jared Kushner.

The White House had indicated its delegation was ready to travel, but Tehran’s decision to pull out has left the diplomatic process in limbo. Iranian officials linked their withdrawal to the recent seizure of an Iranian-flagged cargo vessel by the US Navy, which they described as a violation of the current ceasefire.

The US has defended its actions, stating the vessel ignored warnings and attempted to bypass a naval blockade imposed on Iranian ports. The blockade was introduced after Iran shut down the Strait of Hormuz earlier in the conflict, a move that disrupted a key global oil route.

President Donald Trump has insisted the blockade will remain in place until Iran reopens the waterway to international shipping. In a statement on social media, he said the restrictions were placing severe economic pressure on Tehran and would not be lifted without a deal.

Iranian leaders have rejected negotiations under what they describe as coercion. Parliament Speaker Mohammad Bagher Ghalibaf accused Washington of trying to force a surrender through military and economic pressure. He warned that Iran had prepared new military options if the situation escalates.

The Islamic Revolutionary Guard Corps has also issued warnings, saying any vessel attempting to pass through the Strait of Hormuz without permission could be targeted. The waterway is a critical route for global energy supplies, carrying roughly one-fifth of the world’s oil exports.

As the ceasefire approaches its expiration, fears are growing that the fragile pause in fighting could collapse. Oil markets remain sensitive to developments, with prices still elevated despite easing from pre-ceasefire peaks. Brent crude was trading just above $95 per barrel on Tuesday, reflecting ongoing uncertainty.

With both sides maintaining hardline positions and no confirmed timeline for renewed talks, the risk of further conflict remains high. The outcome of the stalled negotiations is likely to have significant implications not only for the region but also for global energy markets and economic stability.

Hundreds of thousands of German-made components are being used in Russian drones and weapons systems, with investigators pointing to complex international supply chains that allow parts to reach Russia despite sanctions imposed after its war in Ukraine.

Ukraine’s military intelligence agency has identified at least 137 components of German origin in Russian military equipment, including drones, missiles and armoured vehicles. Many of these parts are considered essential for the operation of systems such as the Geran series of drones, which have been widely deployed in attacks.

Among the most frequently identified components are transistors produced by Infineon Technologies. The company said it condemns the war and has halted all direct and indirect deliveries to Russia since 2022, adding that it enforces strict controls and contractual clauses prohibiting resale to sanctioned destinations.

Other components, including fuel pumps, have been linked to Bosch, which also said it has ceased business with Russia. The company noted that some items found in drones could be counterfeit or standard products originally sold for civilian use, making their final destination difficult to track.

The findings highlight how dual-use goods, which can serve both civilian and military purposes, are vulnerable to diversion. Experts say these components often travel through intermediaries in third countries before reaching Russia. Transit hubs such as China and Turkey have been cited in investigations, alongside trading firms that obscure the origin and end use of goods.

A reported case involved a sensor produced by Austrian firm ams-OSRAM that was shipped to a company in Hong Kong and later transferred onward. Despite contractual restrictions, the component was eventually discovered in a Russian drone.

Analysts say Russia’s ability to produce drones such as the Shahed-type systems on a large scale relies heavily on these imported components. The Institute for Science and International Security reported that Russia launched more than 6,400 such drones in March 2026 alone, a record monthly figure.

Manufacturers argue that monitoring supply chains beyond initial sales is extremely difficult due to the global scale of distribution networks. Rheinmetall said it learned from authorities that some of its automotive components had reached Russia without its knowledge, stressing that it complies with all sanctions and cooperates with investigations.

Sanctions experts warn that enforcement gaps remain. According to advocacy group B4Ukraine, current European Union export controls often focus on individual companies rather than broader networks of intermediaries, allowing circumvention to persist.

The group has called for tighter rules, including lower thresholds for requiring export licences when there is suspicion of military use, and mandatory due diligence checks by exporters. It also recommends expanding oversight to industries considered strategically sensitive, such as electronics and mechanical engineering.

Despite sweeping sanctions imposed by the European Union, investigators say Western technology continues to appear in Russian weapons, underscoring the challenges of policing global supply chains in a highly interconnected economy.

The Strait of Hormuz remained closed on Sunday as tensions between Iran and the United States persisted, with both sides signalling that a final agreement remains distant despite ongoing negotiations.

Iranian officials said the key shipping route would not reopen unless Washington lifts its naval blockade of Iranian ports, a central sticking point in the talks. The waterway, through which roughly a fifth of the world’s oil and liquefied natural gas typically passes, has become a focal point in the broader conflict.

Mohammad Bagher Ghalibaf, speaker of Iran’s parliament, said there had been some progress in discussions but warned that major differences remained. In a televised address, he noted that negotiations were still far from reaching a final stage, with several unresolved issues between the two sides.

The latest developments follow high-level talks hosted in Pakistan that failed to produce a breakthrough. Mediation efforts are continuing, though uncertainty surrounds the future of a two-week ceasefire that is due to expire later this week.

Donald Trump said discussions with Tehran were ongoing and described them as constructive, but cautioned Iran against using the strategic waterway as a bargaining tool. He maintained that the US blockade would stay in place until a broader agreement is secured.

Iran had briefly announced that the strait would reopen after a ceasefire linked to fighting in Lebanon, which had raised hopes in global markets and led to a drop in oil prices. However, Tehran reversed that decision shortly afterward, citing the continuation of US restrictions on its ports.

Iranian leaders have taken a firm stance on the issue. Mojtaba Khamenei said the country’s naval forces were prepared to respond to any escalation, while officials warned that vessels attempting to pass through the strait without approval could face consequences.

Shipping activity in the area has slowed sharply. A small number of tankers were reported to have crossed during the brief reopening, but most vessels have since avoided the route. Maritime security agencies have also reported several incidents, including gunfire directed at a tanker and damage to another vessel from an unidentified projectile.

The situation has drawn international concern. India summoned Iran’s ambassador following reports involving Indian-flagged ships, highlighting the broader risks to global trade and energy supplies.

As negotiations continue, the status of the Strait of Hormuz remains uncertain, with both sides holding firm on key demands and the risk of further disruption to international shipping still present.