OSLO, Norway – An Afghan teenager who lost both legs in a cluster bomb explosion helped persuade his country to change its stance and join nearly 100 nations in signing a treaty Wednesday banning the disputed weapons.

Afghanistan was initially reluctant to join the pact — which the United States and Russia have refused to support — but agreed to after lobbying by victims maimed by cluster munitions, including 17-year-old Soraj Ghulan Habib. The teen, who uses a wheelchair, met with his country's ambassador to Norway, Jawed Ludin, at a two-day signing conference in Oslo.