Yars does not appear to be a Russian word but the Slavic root яр (yar) is present, being a bank or steep ravine, consistent with the nomenclature of another newly fielded Russian missile, the RS-26 Rubezh (РС-26 Рубеж) meaning a boundary or outer limit. According to Sergey Karakaev, commander of the Strategic Missile Forces, Yars is an acronym for "Yadernaya Raketa Sderzhivaniya" (Russian: Ядерная ракета сдерживания), meaning "Nuclear Deterrence Rocket".[15]