Prime Minister Yusuf Raza Gilani has said allegations that Islamabad cooperated with North Korea's nuclear program were unfounded and represented a thing of the past.
In an interview with Korean News Agency, the premier said the matter has been investigated with Pakistan officially denying any involvement in Pyongyang's weapons program.
"There had been some disinformation and allegations during the past, but now it is a closed chapter that we have already denied," Gilani stressed.
The comments come as South Korea prepares to host the second Nuclear Security Summit (NSS) on Monday and Tuesday.
The South Asian country has on occasion received flak because of suspicions that it may have played a role in helping Pyongyang build nuclear weapons. Pakistan, which has been in an arms race and has territorial disputes with neighboring India, started its own nuclear weapons program and conducted its first known nuclear test in May 1998 after Indian tests.
North Korea detonated two nuclear devices in 2006 and in 2009, despite condemnation by the international community.
Gilani said that in the upcoming NSS gathering, there is a need for the world to come up with a strategy to safeguard fissile materials that can be used for weapons of mass destruction.
The prime minister said his country has developed very effective command and control systems to protect nuclear materials, and will share this knowhow in the future with the rest of the world.
He said international cooperation is important because nuclear safety requires wide, concerted efforts by many countries.
Gilani, meanwhile, said that Pakistan has maintained excellent relations with South Korea since normalization of diplomatic ties in 1983 and wants to expand economic cooperation.
He asked for more South Korean investment in such areas and infrastructure building.
The prime minister arrived here for the Seoul FSS that will be attended by representatives from 58 nations and four international organizations, including 45 heads of state.