Sources from the US expressed their disappointment with China's tactics of "using Pakistan's non credentials with the NSG to settle scores with India." The "either both or none" strategy is not a secret; it was coordinated during the visit of Pakistan's President Mamnoon Hussain to China in November 2015. According to sources, the Chinese government told President Hussain that if India is allowed into the NSG, China would ensure that Pakistan also gets its membership in the group. However, "if India is allowed to join the NSG and Pakistan is deprived of NSG membership, Beijing will veto the move and block the Indian entry."
Giving further insight into the plan, US sources added that China "would be naive to expect that there won't be an Indian reaction, and especially a commercial one, as China is mindful that India is fully qualified to join the NSG, and by playing the ‘Pakistan parity card,' China is only hurting its own interests with an upcoming economic power, India."
The NSG is a group of 48 nuclear supplier countries and was established in 1975 to control the export and re-transfer of materials used in the production of nuclear weapons.