Will the Minister join me in putting aside questions of blame and responsibility, and consider the nature of nuclear arms control? It can reasonably be said that its architecture is crumbling before our eyes. It is not just the INF treaty; it is the Iran nuclear treaty, the prospects for renewal of the Strategic Arms Reduction Treaty between the United States and Russia—which are generally now described as very unlikely—and the fact that the comprehensive test-ban treaty, first available in September 1996, is still not yet in force. We have in front of us, in 2020, the next review conference of the nuclear non-proliferation treaty. Would the Minister like to share with us precisely what position the United Kingdom is going to take in 2020 on the nuclear non-proliferation treaty, given that all around us it appears that nuclear arms control is disappearing before our eyes?