Russia launched a new intermediate-range ballistic missile on Thursday toward Dnipro in Ukraine, an attack that officials in Kyiv initially said was an intercontinental ballistic missile.The experimental IRBM was based on a Russian RS-26 Rubezh missile, deputy Pentagon press secretary Sabrina Singh confirmed Thursday during a briefing, without going into any other specific details. She also confirmed that the U.S. was notified "briefly" before the launch.A U.S. official told ABC News that the United States briefed Ukraine and other close allies and partners in recent days on Russia's possible use of such a weapon in order to help them prepare....