Consideration of a national missile defence system by the United States had been prompted by growing concerns about the acquisition of long-range ballistic missile capabilities by some countries that did not form part of established deterrence relationships.
87. 美国对一些不构成既定威慑关系组成部分的国家获得远程弹道导弹的能力日益关注，于是考虑部署国家导弹防御系统。