Global security meeting in Baghdad starts today.

The meeting ....... is a follow-up to last month's talks between Iran and the so-called P5+1: the United States, France, Russia, China, Britain -- the five permanent members of the U.N. Security Council -- plus Germany.

Tensions over Iran's nuclear program have unsettled the Middle East, with Iran threatening earlier this year to close the Strait of Hormuz, a vital oil shipping lane, if sanctions were imposed on its exports of crude oil.