Prime Minister Muhammad Nawaz Sharif Saturday chaired a meeting on preparation of Heart of Asia conference, being held in Islamabad next week. In the meeting held at the Prime Minister House, issues related to regional and national security were discussed. Advisor to PM on Foreign Affairs Sartaj Aziz, National Security Advisor lieutenant General Nasir Janjua (Retd), DG ISI General Rizwan Akhtar, Special Assistant to PM Tariq Fatemi and senior officials attended the meeting, said a press release.