In 1998, India carried out nuclear tests; and a few days later, Pakistan responded with nuclear tests of its own, giving both countries nuclear deterrence capability, although India had tested a hydrogen bomb, which Pakistan lacked. Diplomatic tensions eased after the Lahore Summit was held in 1999. However, the sense of optimism was short-lived. In mid-1999, Pakistani paramilitary forces and Kashmiri insurgents captured the deserted, but strategic, Himalayan heights in the Kargil district of India. These had been vacated by the Indian Army during the onset of the inhospitable winter and were to be reoccupied in spring. The troops that took control of these areas received important support, of both arms and supplies, from Pakistan. Some of the heights under their control, which also included the Tiger Hill, overlooked the vital Srinagar–Leh Highway (NH 1A), Batalik, and Dras.