Obama and China's President Talk Iran, Currency

Obama has been meeting with world leaders individually. See the nuclear summit schedule here.

Their 90-minute encounter came at the start of a two-day nuclear security summit of nearly 50 countries aimed at finding ways to prevent terrorists from getting their hands on weapons-grade nuclear material.

Ukraine provided the first example by agreeing to give up its highly enriched uranium.

Iran's nuclear program, which the West fears is a cover to build an atomic bomb, is not on the agenda of the summit, but the presence of so many world leaders in one place gave Obama an opportunity to again make his case for fresh sanctions to be imposed on Tehran over its refusal to halt uranium enrichment.

U.S. and Chinese officials who briefed reporters after the talks described a positive, constructive atmosphere on Iran. China, which has close economic ties with Iran, has been reluctant to sign on to tougher sanctions.

Obama also raised U.S. concerns about China's currency, the yuan, and urged the country to move to a more market-oriented exchange rate. Read more at Reuters