Conversation so far:
What was Nuclear policy and its connection with Nawaz Sharif?
Nawaz Sharif made the nuclear weapons and energy programme one of his top priorities.
How was Nawaz Sharif involved with Nuclear policy?
Nawaz Sharif expanded the nuclear energy program, and continued an atomic programme while following a policy of deliberate nuclear ambiguity

Question: When did he announce the policy?
Self-contained rewrite: When did Nawaz Sharif announce nuclear policy?