Washington DC, Dec. 26 -- Newly declassified documents from the US National Security Archive revealed that Pakistan's nuclear proliferation was a significant concern for both the US and Russia, with leaders expressing "nervous" fears about the country's atomic stability.

Conversations between former US President George W Bush and Russian President Vladimir Putin revealed deep concerns over Pakistan's nuclear proliferation activities, with both leaders expressing that the situation made them "nervous", particularly regarding links to Iran's nuclear programme and the AQ Khan network.

The documents, released this week by the National Security Archive following a Freedom of Information lawsuit, include verbatim records of meetings and calls...