Fourth, traditional treaty-based arms control between the United States and China remains premature. Even so, the two countries could begin a dialogue between their experts on arms control verification technology, practice, and experience as part of their overall commitment to the Nuclear Non-Proliferation Treaty (NPT). Again at the expert level, it also may serve both countries’ strategic interests to begin a low-key discussion of the concept of less formal mutual strategic restraint across the offenses-defenses, space, and cyber areas. What would mutual restraint entail, what principles might guide that process, when should it be pursued, and how might each country signal its restraint? Mutual strategic restraint would build on the unilateral restraint that both countries already often show in their strategic postures. The goal would be to lessen mutual uncertainties and build habits of strategic cooperation.