Washington, March 25 -- United States has put a 15-point peace plan into circulation through back-channels, aimed at ending its conflict with Iran now entering its fourth week, even as it remains unclear how widely the proposal has reached Iranian decision-makers or whether Tehran would accept it as a framework for talks.

Into this diplomatic vacuum, Pakistani Prime Minister Shehbaz Sharif has stepped forward, formally offering Islamabad as a neutral venue for what could become the war's first direct negotiations.

The plan reportedly addresses Iran's ballistic missile and nuclear programs, as well as maritime security in the Strait of Hormuz ,that Iran has largely blocked, disrupting oil and gas supplies worldwide. It remains unclear, how...