Meanwhile, fighting between Hezbollah and Israeli forces continued in southern Lebanon over the weekend despite a recent ceasefire arrangement aimed at reducing cross-border hostilities.

The exchanges underscored the challenges facing any broader regional settlement, with unresolved conflicts involving Iran-backed armed groups remaining a major sticking point.

Iran has maintained that any final agreement with Washington should include a complete withdrawal of Israeli forces from Lebanese territory, adding another complex issue to already difficult negotiations over Tehran's nuclear activities, ballistic missile program and regional influence.