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The RT-21 was the first mobile ICBM developed by the Soviet Union.

It relied heavily on the RT-21M Pioner ( SS-20 Saber ), a shorter-range missile, for its technology.

The program became mired in a series of treaty complications, including questions regarding its use of theatre missile launchers.

Ultimately, it is unlikely that the RT-21 reached deployment, and by the mid-1980s, the program had been scrapped.

Period of storage on launcher 5 years, preparation time for launch 40 minutes