About 50 nations and international groups pledged in Tokyo on Friday to give strife-torn Pakistan more than $5 billion in aid after President Asif Ali Zardari vowed to continue a war against extremists still raging eight years after the Sept. 11 attacks.

Addressing the Friends of Democratic Pakistan Group Ministerial Meeting, Zardari said that although he has taken up the challenge of leading his country, progress cannot be made without international aid.

"We are willing to fight, despite the fact that I lost the mother of my children," Zardari said in his opening remarks, referring to his late wife, the assassinated former Pakistani Prime Minister Benazir Bhutto.