Islamabad Talks Collapse After 21 Hours; Ceasefire Expiry Imminent; Taliban Urges Regional Calm; Af-Pak Non-Escalation Day 12

US negotiators departed Islamabad on April 21 after approximately 21 hours of US-Iran talks ended without a new deal, as the ceasefire brokered by Pakistan approached its expiry at midnight GMT on April 22. President Trump issued a stark warning to Tehran, threatening consequences 'like they've never seen before' if no successor agreement was reached. Iranian Parliament Speaker Mohammad Bagher Ghalibaf struck back, declaring Tehran was 'prepared to reveal new cards on the battlefield' — signaling Iran was ready to resume full military operations if the US naval blockade of Iranian ports was not lifted. The breakdown of the Islamabad round came despite Pakistan's frantic last-hour mediation effort; Pakistani officials spent days shuttling between delegations seeking a bridging formula but found no common ground. Taliban Foreign Ministry Second Political Director Zakir Jalaly made an unusually direct public statement on April 21, expressing concern about the escalating Iran-US confrontation to Iranian interlocutors. Jalaly said Iran's continued attacks across the region were 'a concerning point for the Islamic Emirate' and that 'It's not fair to continue rocketing, targeting these countries.' The statement reflected Afghanistan's acute vulnerability to regional spillover — Iran-adjacent supply corridors through Herat and Nimroz provinces carry critical humanitarian imports, and an Iran-US re-escalation would disrupt the only major alternative to Pakistan's Torkham-controlled routes into Afghanistan. Meanwhile, ISIS-K conducted attacks in Mazar-e-Sharif (Seh Dokan Mosque, Balkh province) and Kunduz on the same day, both claimed by the group — demonstrating persistent ISIS-K capacity in northern Afghanistan even during the broader Af-Pak diplomatic pause. For the Afghanistan-Pakistan bilateral file, April 21 marked the 12th consecutive day without major cross-border military incidents under the Urumqi non-escalation framework — the longest unbroken lull since Operation Ghazab-il-Haq commenced on February 26, 2026. Pakistan's foreign policy apparatus was entirely consumed by the US-Iran crisis, effectively pushing the second round of China-mediated Af-Pak talks — originally expected 'end of April' per the April 9 communiqué — into May. Taliban officials confirmed no date had been set for Urumqi Round 2 but stated Kabul remained committed.