US President Barack Obama touted the "historic understanding" with Iran Thursday.

US President Barack Obama touted the "historic understanding" with Iran Thursday.

"I am convinced that if this framework leads to a final comprehensive deal, it will make our country, our allies and our world safer," Obama said in the White House Rose Garden.

Obama sketched a regimen of "the most robust and intrusive inspections" ever negotiated, coupled with dramatic curbs on Iran's ability to enrich uranium.

In return, he said, the United States would agree to end years of sanctions that have crippled the Iranian economy.