Nairobi, April 12 -- After 21 hours of marathon-like negotiations, the United States and Iran failed to reach an agreement in the latest round of talks, U.S. Vice President JD Vance said on Sunday in Islamabad, Pakistan.

Iran's semi-official Tasnim news agency also reported that negotiations in Islamabad concluded without any outcome, as "excessive demands" by the United States hindered the development of a common framework and agreement.

What happened?

The third round of face-to-face U.S.- Iran talks concluded within a two-week conditional truce window, more than a month after the start of joint U.S.- Israeli military strikes on Iran. The historic talks in Islamabad has drawn global attention amid ongoing turbulence.

However, the tal...