Afghanistan, April 4 -- Pakistan's behind-the-scenes effort to help bring Iran and the United States to the negotiating table has stalled, according to Pakistani media reports citing officials in Islamabad, underscoring the difficulty of diplomacy as the regional conflict continues to deepen. The reports say at least two separate attempts to arrange contact between the two sides failed to move forward despite weeks of indirect engagement.

A senior Pakistani official familiar with the contacts told local media that a high-level U.S. delegation, reportedly led by U.S. Vice President J.D. Vance, had twice been prepared to travel to Islamabad for talks involving Iranian representatives. According to the account, both efforts advanced close to ...