ISLAMABAD: Prime Minister Shehbaz Sharif on Monday declared a public holiday throughout the country on May 28 on account of Youm-i-Takbeer, the day when Pakistan’s defence became impregnable after nuclear tests in the hills of Chagai, Balochistan in 1998. The announcement was made in a notification, a copy of which is available with Dawn.com, issued by the cabinet secretariat. Youm-i-Takbeer is observed on …