https://motherboard.vice.com/en_us/article/ev8vbj/russias-new-super-weapon-hypersonic-missile-atomic-powered

The Russian government recently revealed new details about several high-tech, nuclear super-weapons that the Kremlin has claimed are essentially invulnerable to enemy defenses. But experts say Moscow is exaggerating, and that none of the new weapons fundamentally alter the balance of power between Russia and its rivals, including the United States.

The new munitions do, however, "introduce additional uncertainties and risks" in the US-Russian relationship, Pavel Podvig, an independent expert on Russian weaponry, told me.