The silo-based SS-24 Mod-1 (15Zh60) was deployed in silos formerly occupied by SS-17 Sego ICBMs, starting on 28 November 1989, and the first regiment of silo-based missiles was activated on 19 August 1988. Altogether 56 silo-based RT-23UTTh missiles were initially deployed, with 10 at Tatishchevo in Russia and 46 at Pervomaysk in Ukraine. A total of 46 silo-based RT-23UTTh missiles located in Ukraine were phased out and dismantled in compliance with the provisions of the START-1 treaty.
In December 1997, the first two Topol-M systems were put on alert for a trial period with the Taman Division at Tatischevo in the Saratov region. As of late July 1998 two more Topol-M launch sites were completed and were awaiting acceptance trials. Russia put a regiment of 10 Topol-M missiles on duty in 1998, with plans for a second regiment by December 1999.
