6: Victor Karpov, Head of the Soviet Arms Control and Disarmament Directorate.
One of the Soviet Union's most experienced negotiators, he led the Russian arms team until he was replaced following the abortive Reykjavik summit. He nevertheless continues to play a key role in Soviet disarmament policy, and is regarded by Western diplomats as tough, urbane and intelligent.
Sue MacGregor is in the chair, as one of the Soviet Union's most eminent arms negotiators talks to callers from around the world.
Producers JANICE HADLOW for the Woman 's Hour unit and NEIL CURRY for the BBC World Service
(A simultaneous broadcast with BBC World Service)
Lines open from 10.0am