The Pentagon says the Oreshnik is a tweak of Russia’s RS-26 Rubezh missile, an intercontinental ballistic missile (ICBM) that has been tested since 2011.

Russia named the missile the Oreshnik, or hazel tree, and said it is impossible to intercept it with air defenses.

Russian President Vladimir Putin confirmed Podvig’s assertion Thursday afternoon, when he announced the weapon that struck Dnipro was an experimental medium-range ballistic missile called “Oreshnik.” MRBMs typically travel no farther than 600 miles.