When Viktor Zolotov, director of the Russian National Guard, briefed his boss, President Vladimir Putin, on Tuesday on the status of military operations in Ukraine, one remark in particular stood out. “I especially want to emphasize that we feel the support of the population in the liberated territories,” Zolotov told a stone-faced Putin. In reality, Russia has been struggling to rally the support of its own troops, according to internal government documents obtained exclusively by Yahoo News that detail drunken acts of insubordination six months into Putin’s invasion. The documents include an incident and homicide report by the Russian Investigative...