Russia threatened yesterday to pull out of a landmark nuclear arms control treaty unless the US backed away from plans to install its missile defence shield in Eastern Europe.

• 俄罗斯昨日威胁称,如果美国不放弃在东欧地区部署导弹防御系统的计划,俄罗斯将退出具有划时代意义的核武器控制条约。