President Asif Ali Zardari on Thursday assured the Ambassador of China to Pakistan Jiang Zaidong that Pakistan would take all necessary measures to ensure the security of Chinese nationals working on different projects in Pakistan. Ambassador Zaidong called on President Zardari at Aiwan-e-Sadr where the two discussed matters of mutual interest, besides underscoring the need to increase counterterrorism cooperation and intelligence sharing to overcome the menace of terrorism.