US-Iran Ceasefire Set to Expire Tuesday as Military Tensions Rise in Persian Gulf

A two-week ceasefire between the United States and Iran was set to expire on Tuesday, April 21, 2026, at 8 p.m. US Eastern Time, as US forces seized the Iranian-flagged cargo ship Touska in the Strait of Hormuz after it allegedly breached a blockade line, pushing oil prices up by approximately five percent and bringing ship traffic through the waterway to a near standstill. US Vice President J.D. Vance traveled to Islamabad, Pakistan, on Monday evening for potential peace talks, even as Iran's government said it had not yet made a final decision on whether to participate in a new round of negotiations. A high-ranking Iranian insider told Reuters that Tehran was "positive" toward participation, though no second round of talks was formally scheduled. The seizure of the Touska, which belongs to the state shipping company Islamic Republic of Iran Shipping Lines, came at the precise moment President Donald Trump had signaled openness to new negotiations in Islamabad, a juxtaposition that drew sharp criticism from Tehran and unease from mediator Pakistan.

Marines rappel onto Touska after six-hour standoff The seizure of the Touska unfolded over six hours in the Strait of Hormuz after the vessel's captain reportedly ignored US Navy orders to stop. According to the US military, the ship had been traveling from Malaysia toward the Iranian port of Bandar Abbas and had previously made regular runs between China and Iran. After the Touska crossed the blockade line declared by the Navy, the guided-missile destroyer USS Spruance fired into the ship's engine room to disable it, after crew members had been warned via radio to leave the engine room first. US Central Command released night-vision video showing Marines rappelling from helicopters launched from the amphibious assault ship USS Tripoli onto the Touska's deck. Iranian state media described the operation as "armed piracy," and a spokesman for the Iranian armed forces said forces had initially considered retaking the vessel by force but refrained out of concern for the safety of crew members' families. China, identified in the articles as the main buyer of Iranian crude oil, expressed concern over the interception, with President Xi Jinping calling for the resumption of normal passage through the Strait of Hormuz, according to the official Xinhua news agency.

Key events around the ceasefire expiry: — ; — ; — ; — ; —

Pakistan's army chief tells Trump blockade blocks talks Pakistan's role as mediator came under strain as the Touska seizure complicated Islamabad's efforts to bring both sides back to the table. According to agency reports cited by the Frankfurter Allgemeine Zeitung, Pakistani Army Chief Field Marshal Asim Munir told Trump in a telephone call that the US blockade of Iranian ports was an obstacle to the negotiations. Iran had previously made lifting the blockade a precondition for returning to talks, and a high-ranking Iranian insider confirmed that Pakistan was actively working to secure that outcome. Trump, asked over the weekend whether he would extend the ceasefire, replied: „"I don't know. Maybe not. Maybe I won't extend it. But the blockade will stay."” — Donald Trump via Handelsblatt The Iranian Foreign Ministry spokesman said on Monday that the American seizure of the Touska called into question the "seriousness" of the diplomatic process, but did not rule out continued negotiations. The Revolutionary Guard threatened retaliation while signaling it did not want to escalate further, according to the Neue Zürcher Zeitung. Danny Citrinowicz, described as a former head of the Iran branch of the Israeli military intelligence service, told the NZZ that no agreement was likely as long as the US naval blockade remained in place, adding: „After 40 days of war, the Iranian position has not fundamentally changed.” — Danny Citrinowicz via Neue Zürcher Zeitung

The US-Israel military campaign against Iran, known as Operation Epic Fury, began on February 28, 2026, and resulted in the death of Supreme Leader Ali Khamenei in the initial strikes. His son Mojtaba Khamenei was appointed Supreme Leader on March 9, 2026. The two-week ceasefire announced by Trump on April 7 represented the first significant pause in hostilities since the campaign began. The Strait of Hormuz, through which approximately one-fifth of the world's oil and liquefied natural gas supply normally passes according to the source articles, has been a central point of leverage for Iran throughout the conflict.

German shipowners warn of 2,000 vessels stranded with no safe route The near-paralysis of the Strait of Hormuz was leaving roughly 2,000 merchant ships and approximately 20,000 seafarers stranded in the region, according to reporting by Wirtschaftswoche. The German Shipowners' Association (VDR) said in a statement that conditions offered "no reliably plannable or permanently secured passage," citing multiple attacks on merchant vessels in recent weeks. The VDR also warned that Iran's reported proposal of a transit fee of 2 (million USD per ship) — Iran's proposed Strait of Hormuz transit fee per vessel was "not covered by international law" and that payments flowing to sanctioned Iranian actors would expose shipowners to legal risk. The association said it was ruling out both such payments and passage under current conditions, with security authorities also advising against transit. Only three ships passed through the strait in a twelve-hour window on Monday, according to the articles. Financial markets reflected the uncertainty: Maximilian Wienke, market analyst at eToro, wrote that markets were "showing signs of nervousness, without however falling into a panic," and said he did not expect major price movements until the ceasefire formally expired. The base assumption among analysts, according to Handelsblatt, remained that talks between the US and Iran would take place during the week, though the diplomatic path had narrowed sharply following the Touska incident.