Short man syndrome, also known as Napoleon Complex could explain a lot about North Korean leader Kim Jong-Un.    Talking Tough, just threatened Australia of attack if they remain allies of U.S. and now China (with catastrophic consequences) (see link below).   He always threatens U.S., wants to destroy us.

Short man syndrome is an informal term and not a medical or psychological condition and goes by other names such as ‘Napoleon complex’. Technically it is a form of inferiority complex in which the person attempts to overcompensate for their perceived shortcoming.

http://www.dailymail.co.uk/sciencetech/article-3125722/Are-short-men-little-Napoleons-s-said-smaller-men-tend-chippy-aggressive-s-scientific-evidence.html

http://www.neonnettle.com/features/871-north-korea-threaten-china-with-catastrophic-consequences-for-supporting-trump

Let me be clear, most men of short stature do not have this behavior.