The Kremlin Device by Chris Ryan

Geordie Sharp is asked to undertake an
SAS operation so outrageous that his conscience will barely allow him to
carry it out.

The ostensible aim of Operation NIMROD is
to train a new Spetznaz unit to combat the threat of the Russian mafia, but
Sharp’s orders contain a sinister hidden agenda.

When
two SAS men are lifted by Mafia agents, the British authorities’ secret
weapon is turned against London and only Geordie Sharp can save the day.