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.

President Vladimir Putin said Friday that Russia will continue to test and start mass-producing the hypersonic ballistic missile that it fired at Ukraine Thursday.

President Vladimir Putin warned that his forces could strike “decision-making centers” in the Ukrainian capital of Kyiv with new ballistic missiles as retaliation for attacks on Russia using Western missiles.

NATO members on Tuesday reaffirmed their support for Ukraine during talks with the country's officials held in response to Russia's launch of an experimental intermediate-range ballistic missile last week.

Ukraine's Foreign Minister Andrii Sybiha has announced that the Russian attack on the city of Dnipro with an Oreshnik experimental ballistic missile will be discussed at the Organisation for Security and Cooperation in Europe on Wednesday,

The new design is based on the previous RS-26 Rubezh ballistic missile, according to the Pentagon. Readers can get up to speed on what else is already known about the missile strike on the eastern Ukrainian city of Dnipro in The War Zone‘s initial reporting here.

The first combat use of Russia’s new IRBM — which Russian President Vladimir Putin called unstoppable — has drawn scrutiny from Western military experts.

Russia’s new ballistic missile flies on a high arc out of Earth’s atmosphere and releases multiple high-speed projectiles, making it challenging but not impossible to intercept

Russia's new Oreshnik missile is capable of carrying nuclear weapons. However, it is not yet known what kind of explosives, if any, the missile used to hit the Dnipro, The New York Times reports. According to the agency,