The key thing on matters relating to nuclear weapons and fissile material is that those states that possess these arms and material are all willing to participate in a negotiation toward some restriction. You can understand the lack of attraction if you had countries saying it would be fine if the rest agree to stop production but they would not participate in that negotiation. It's getting that formula whereby those countries are going to feel they have a stake in it and will participate. That is the challenge. In some cases it is very hard to read all the factors that may determine why a given state has taken the diplomatic posture it has. China is a case in point.
Evidence of meeting #59 for Foreign Affairs and International Development in the 39th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was npt.
A recording is available from Parliament.