In response to concerns about the RS-28 Sarmat, Putin has ruled out the need to modify Russia's military doctrine. He stated that Russia would only resort to using nuclear weapons if it suffered a nuclear attack or if the existence of the Russian state was threatened, even by conventional weapons. Furthermore, Putin issued a stern warning that any aggression against Russia would be met with a response involving the launch of "hundreds of missiles" to prevent an adversary from having a chance to

Russia's new RS-28 Sarmat intercontinental ballistic missile test failed miserably. The missile lost control and crashed to the ground seconds after launch. Several sources claim that the missile was likely carrying the Avangard hypersonic glide vehicle. The incident is seen as a major setback for Russia's strategic missile program. Source: Ukrinform English ,Ukrinform | Irani Military