Pakistan is a unique nuclear weapons state. It has been both the recipient of technology transfers from other states and a supplier of technology to still other states. It has been a state sponsor of proliferation and has tolerated private sector proliferation as well. Pakistan has engaged in highly provocative behavior against India, even initiating a limited war, and sponsored terrorist groups that have engaged in mass casualty terrorism inside India’s cities, most recently last November in Mumbai. No other nuclear weapons state has done all of these provocative actions.