India's position that disgraced Pakistani nuclear scientist AQ Khan could not have acted individually stands vindicated with his admission that Islamabad was involved in the proliferation activities involving China, Iran, North Korea and Libya, experts say.

"In any case, it is very well known that AQ Khan and Pakistan had worked together in proliferation of nuclear technology. It was also known that China and Pakistan were working together. The letter by Khan is a confirmation of all these," former National Security Adviser Brajesh Mishra said.