Grand structural theories cannot be expected to explain either the process or the path of efforts to coordinate superpower diplomacy, only perhaps the frustrating outcome of those efforts to date. As Miller also points out, and as evidence from other chapters in this volume demonstrates, the overwhelming of collaborative processes was not the result of equal disinterest or distrust on both sides. The frustration was not caused by bipolarity per se; were that the case, we would expect both superpowers to be equally disinterested in collaboration. Rather, the relative power of the United States and the Soviet Union in the region appears to have fed into their calculations of their interests. Thus, perhaps because of her greater political and economic leverage in the region, and because of her exclusive leverage over Israel, the U.S. government since 1970 has been consistently less interested than the USSR in superpower collaboration as a mechanism for settling Middle East conflicts.