After the restoration of democracy after the disastrous and mysterious death of Zia and U.S. Ambassador in an aviation crash, relations deteriorated quickly with upcoming prime ministers Benazir Bhutto and Nawaz Sharif. The United States took a tough stand on Pakistan's nuclear development, passing the Pressler amendment, while significantly improving the relations with India. Both Benazir and Nawaz Sharif also asked the United States to take steps to stop the Indian nuclear program, feeling that United States was not doing enough to address what Pakistan saw as an existential threat. Pakistan found itself in a state of extremely high insecurity as tensions mounted with India and Afghanistan's infighting continued. Pakistan's alliance with the U.S. was strained due to factors such as its support for the Taliban and public distancing of the Pakistani government from the U.S.