A senior U.S. Department of Defense official told reporters on a call that intelligence has “indications that morale is flagging in some” of the Russian forces’ units. “We have picked up independently on our own, indications that morale is flagging in some of these units. That they again did not expect the resistance that they were going to get, and that their own morale has suffered as a result,” the official told reporters Tuesday. A large number of Russian troops that are being used in the invasion of Ukraine are “conscripts” and “very young men drafted into service,” the official added. The official did not say how that intelligence was gathered. Not all of the Russian troops were fully trained and prepared to go into battle, the official continued to say. On Tuesday, Russia warned Kyiv residents to flee their homes while hammering the border city of Kharkiv. Some analysts have said that …