During the long, tortuous nuclear-test-ban wrangle between the U.S. and Russia, it often seemed that neither side really expected a test ban, that the wall of suspicion between the two nations was unbreachable. But two weeks ago, the world caught a glint of something that hinted at Russian willingness to negotiate. At the U.S.-British-Soviet test-ban conference in Geneva, Russian Delegate Semyon K.
Tsarapkin made what seemed to be a significant concession.
In a departure from Russia's longtime insistence that a nuclear test ban must start with a flat ban on all tests, detectable...