In the self-declared Donetsk People's Republic, the breakaway region of eastern Ukraine, training for war starts young. Teenage girls wearing Russian military uniforms spend Saturday afternoons taking apart and putting together Kalashnikovs. The average Russian soldier needs more than 10 seconds to break one down; 15-year-old Katerina, who declined to give her last name, takes just 9 seconds. With a blindfold on.