#hyperhype
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1) Avangard is being introduced into #NewSTART because its booster is basically an ICBM: UR-100NUTTKh/RS-18X/SS-19 Mod...
2) It was mentioned as SS-19 Mod-X-4 in US NPR 2018
3) RS-26 is/was a designator for Rubezh "light" ICBM prototype within NewSTART process
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The Avangard might receive a RS-18/SS-19 - ish designator eventually. Entirely new designator is also possible, but RS-26 is highly unlikely.
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