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.

Russian President Vladimir Putin said in a televised address that the attack was a test of Russia's "newest missile," an IRBM called "Oreshnik."

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