WASHINGTON US President Barack Obama will separately meet on Sunday Prime Minister Syed Yusuf Raza Gilani and his Indian counterpart Manmohan singh on the sidelines of the Nuclear Security Summit here, but a meeting between the two South Asian leaders appears unlikely. Over the past few days, Indian officials have ruled out any bilateral meeting between Singh and Gilani on the sidelines of the April 12-13 summit, which would bring together leaders of besides Pakistan 45 other countries. On Friday, a top White House official said Obama will discuss with the Pakistani leader the strengthening of United States wide-ranging partnership with Pakistan. The United States and Pakistan have a deepening partnership on a range of issues, and the President looks forward to this opportunity to continue strengthening that partnership in his discussions with Prime Minister Gilani, Ben Rhodes, Deputy National Security Advisor for Strategic Communications, said. Prime Minister Gilani is also expected to meet other world leaders on the sidelines of the Nuclear Security Summit in Washington next week.