WASHINGTON (Agencies) - US President Barack Obama and Indian Prime Minister Manmohan Singh met here on Sunday afternoon in delegation level talks to take stock of the state of bilateral ties and exchange views on a number of issues, from the situation in Afghanistan and Pakistan to the need for a diplomatic resolution of the Iranian nuclear issue. This is the fourth meeting between the two leaders in the past seven months. US President Barack Obama launched a flurry of meetings with world leaders on the eve of his nuclear security summit, with talks with Manmohan. President Obama was accompanied by Secretary of State Hillary Clinton, National Security Adviser James Jones and Assistant Secretary of State for South and Central Asia, Robert Blake. Indian Prime Minister Singhs delegation included National Security Adviser Shiv Shankar Menon, Foreign Secretary Nirupama Rao, Ambassador Meera Shankar and other senior officials. Obama and Singh met in the Blair House residence, opposite the White House, but did not speak to reporters ushered into the meeting, with the US President merely saying thank you to end their photo op. Dozens of world leaders have been flying into a heavily-secured Washington on the eve of the summit, and Obama will hold a string of bilateral consultations with world leaders over the next two days. US President Obama also met his Kazakh counterpart Nursultan Nazarbayev, as he set the table for his 47-nation nuclear security summit designed to deprive extremists of nuclear material. Kazakhstan ceded its portion of a vast Cold War nuclear arsenal after the Soviet Union collapsed, but says it is the worlds leading exporter of uranium, a nuclear fuel which is at the centre of the summit, which opens Monday (today). Obama and Nazarbayev met at Blair House, across Pennsylvania Avenue from the White House. Kazakhstan said last year that it had overtaken Canada to become the worlds leading exporter of uranium after it increased production by 63 percent in 2009. Last year, the Central Asian republic denied it planned to sell purified uranium ore to Iran, which is currently locked in a nuclear showdown with the United States, and the West. The United States had said that such a transfer would be prohibited under United Nations sanctions on Iran, which Washington and its allies are currently attempting to stiffen.