That the RS-24, also known as the Topol-MR, carried multiple warheads was already well established. From all accounts, the initial version was simply a modification of the original RS-12M Topol-M to allow it to carry multiple independently targetable reentry vehicles, or MIRVs, each able to strike a separate target. The United States has argued that the new designation is simply an attempt to circumvent existing Strategic Arms Reduction Treaty (START) limitations on the total number of warheads U.S. and Russian forces can have available on ICBMs.
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