BEIJING: Pakistan’s Ambassador to China Masood Khan, who is also his country’s chief negotiator on the Nuclear Security Summit process has left here for Buenos Aires to attend the Nuclear Security Summit Sherpa Meeting. Representatives of Strategic Plans Division and Foreign Office are part of Pakistan delegation, it was learnt here Tuesday.The meeting which is being hosted by the Argentinean Government will be held on 2-3 November. Representatives from 47 countries and three international organizations are expected to attend the meeting.The meeting is being co-chaired by the representatives of the United States of America, that hosted the first Nuclear Security Summit, and of the Republic of Korea, who will be hosting the second Nuclear Security Summit.Prime Minister Yusuf Raza Gilani led Pakistan delegation to the Nulcear Security Summit held in April this year in Washington. During the visit Prime Minister Gilani had a broad range of discussions with President Barak Obama on bilateral issues.The meeting is taking place as a result of an agreement reached between the Heads of State and Government during the Nuclear Security Summit held in Washington in April 2010 that a follow-up Sherpa Meeting would be held before the end of 2010 – App