There have been numerous attempts to improve the relationship — notably , the Shimla summit , the Agra summit and the Lahore summit . Since the early 1980s , relations between the two nations soured particularly after the Siachen conflict , the intensification of Kashmir insurgency in 1989 , Indian and Pakistani nuclear tests in 1998 and the 1999 Kargil war . Certain confidence-building measures — such as the 2003 ceasefire agreement and the Delhi – Lahore Bus service – were successful in de-escalating tensions . However , these efforts have been impeded by periodic terrorist attacks . The 2001 Indian Parliament attack almost brought the two nations to the brink of a nuclear war . The 2007 Samjhauta Express bombings , which killed 68 civilians ( most of whom were Pakistani ) , was also a crucial point in relations . Additionally , the 2008 Mumbai attacks carried out by Pakistani militants resulted in a severe blow to the ongoing India-Pakistan peace talks
2001 Indian Parliament attack
2001 Indian Parliament attack
India–Pakistan relations