Ever wonder why Vladimir Putin Walks Like That?

the quotes below are from the NBC article referenced below.
“Neurology professor Bastiaan Bloem of the Radboud University Medical Center in the Netherlands and colleagues had noticed that Putin often walks with his right arm held rigid, while his left arms swings freely.”

Might it be Parkinson’s disease, which can cause stiff movements?

in an old Russian KGB manual it was discovered:
“According to this manual, KGB operatives were instructed to keep their weapon in their right hand close to their chest and to move forward with one side, usually the left, presumably allowing subjects to draw the gun as quickly as possible when confronted with a foe.”