Afghanistan, April 11 -- US President Donald Trump warned Washington will escalate and "finish" the war if diplomacy fails, vowing to reopen the Strait of Hormuz with or without Iran's cooperation.

Senior delegations from Iran and the United States have arrived in Islamabad for high-stakes negotiations, following days of intensive behind-the-scenes contacts between diplomats aimed at setting the agenda and avoiding an early collapse.

Officials from both sides held indirect and technical-level discussions through intermediaries to narrow differences on ceasefire terms, sanctions relief, and regional security before formal talks begin.

US President Donald Trump warned that Washington is prepared to escalate if diplomacy fails, saying the U...