Kyiv’s Security Service salvaged the remains of the new hypersonic ballistic missile Russia fired at central Ukraine as it warned that Moscow would transform Ukraine into a “testing ground” for its bombs. Charred fragments of the new Oreshnik missile were put on display for reporters on Sunday following its use last week against a military site in Dnipro. The Oreshnik, Russian for hazel tree, appears to be based on Moscow’s RS-26 Rubezh intercontinental ballistic missile and is capable of carrying either conventional or nuclear warheads. Several destroyed components of the rocket were recovered from the blast, including mangled wires and...