HC Deb 22 June 1978 vol 952 c310W
Mr. Churchill

asked the Secretary of State for Defence what information he has about the numbers and general deployment of operational SS20 mobile intermediate range ballistic missiles.

Dr. Gilbert

The SS20 IRBM is being progressively deployed in both the Western and Eastern USSR. By the early 1980s we expect to see the current force of some 600 SS4 and SS5 medium- and intermediate-range ballistic missiles, each with a single warhead, replaced by a lesser number of SS20 IRBMs, each of which carries three warheads.