The parties in Turkey discussed Iran\'s nuclear program for the first time in more than a year and agreed to reconvene in Baghdad on May 23. Talks in Istanbul on Saturday among negotiators from Iran and six world powers including the United States represented \"a positive first step\" in addressing international concern over the Iranian nuclear program, the White House said. The parties in Turkey discussed Iran\'s nuclear program for the first time in more than a year and agreed to reconvene in Baghdad on May 23. Ben Rhodes, deputy national security adviser, said the United States sees room to negotiate over how Iran can meet international obligations under its nuclear program, which Tehran says is for energy and medical purposes but global powers accuse it of \"intending\" to create a weapon. Israel, most experts estimate that it has at least between 100 and 200 nuclear warheads, often threatens the Islamic republic with an attack. \"We believe ... the talks in Istanbul have been a positive first step, that there was a constructive atmosphere, that the Iranians came to the table and engaged in a discussion about their nuclear program,\" Rhodes told reporters in Colombia, where U.S. President Barack Obama is attending a regional summit. The agreement to meet again in Baghdad next month was \"an additional positive sign,\" he said. Other countries involved in the talks also referred to them as \"constructive.\" The six powers included the permanent members of the U.N. Security Council - Russia, the United States, China, France and Britain - along with Germany, a group known as the P5+1.