Atal Bihari Vajpayee of India signed the Lahore Declaration, agreeing to a bilateral moratorium on further nuclear testing. This initiative was taken a year after both countries had publicly tested nuclear weapons. (See Pokhran-II, Chagai-I and II) Since the early 1980s, Pakistan's nuclear proliferation activities have not been without controversy. However, since the arrest of Abdul Qadeer Khan, the government has taken concrete steps to ensure that Nuclear proliferation is not repeated and have assured the IAEA about the transparency of Pakistan's upcoming Chashma Nuclear Power Plant. In November 2006, The International Atomic Energy Agency Board of Governors approved an agreement with the Pakistan Atomic Energy Commission to apply safeguards to new nuclear power plants to be built in the country with Chinese assistance. Protections In May 1999, during the anniversary of Pakistan's first nuclear weapons test, former Prime Minister of Pakistan Nawaz Sharif claimed that Pakistan's nuclear security is the strongest in the world. According to Dr. Abdul Qadeer Khan, Pakistan's nuclear safety program and nuclear security program is the strongest program in the world and there is no such capability in any other country for radical elements to steal or possess nuclear weapons. This claim is strongly disputed by foreign experts, citing the precedent of previous attacks of Pakistani military facilities and the nation's high level of instability. Modernisation and expansion A Washington-based Nuclear Watch think tank of Boston University has reported that Pakistan is increasing its capacity to produce plutonium at its Khushab nuclear facility. The sixth nuclear test (codename: Chagai-II) on 30 May 1998, at Kharan was quite a successful test of a sophisticated, compact, but "powerful plutonium bomb" designed to be carried by aircraft, vessels, and missiles. These are believed to be tritium-boosted weapons. Only a few grams of tritium can result in an increase of the explosive yield by 300% to 400%." Citing new satellite images of the facility, the Institute for Science and International Security (ISIS) said the imagery suggests construction of the second Khushab reactor is "likely finished and that the roof beams are being placed on top of the third Khushab reactor hall". A third and a fourth reactor and ancillary buildings are observed to be under construction at the Khushab site. In an opinion published in The Hindu, former Indian Foreign Secretary Shyam Saran wrote that Pakistan's expanding nuclear capability is "no longer driven solely by its oft-cited fears of