I should have clarified that. The TOPOL they used was modified with a scramjet.
If you Google the following:
TOPOL scramjet
you will see a number of articles about this. Here follows the text of one:
Russia is deploying a new series of nuclear tipped missiles with warheads designed with the aid of US supercomputers. The new Russian SS-27 missile - an uprated version of the SS-25 TOPOL Mod One - is being moved directly into deployment with an advanced 550 kiloton nuclear warhead made by the Arzamas-16 nuclear design bureau. The SS-27 design has also been exported to China and will be built under license as the DF-41.
Russia is testing a new warhead for its SS-27 TOPOL M. The new warhead is reported to be a nuclear-armed supersonic ramjet, or Scramjet, capable of avoiding U.S.-designed anti-ballistic missiles. The recent successful SS-27 test showed the Scramjet warhead was able to fly at high speeds in the upper reaches of the atmosphere.