High-stakes US-Iran talks are set to take place in Islamabad amid rising tensions and hardline positions. Donald Trump has warned Iran to accept a deal or face military action, while expressing limited optimism about diplomacy. On the other side, Iran’s parliamentary speaker Mohammad Bagher Ghalibaf has rejected negotiations under threat. Key US officials, including JD Vance, Jared Kushner, and Steve Witkoff, are expected to participate, with possible representation from Abbas Araghchi.