Donald Trump has accepted Kim Jong-un's invitation to meet in person. No sitting US President has ever met with a North Korean leader.
Dictators, tyrants, strong-men - are sociopaths (aka Antisocial Personality Disorder). They all follow similar patterns of behavior - and this certainly includes their nonverbal nature. With such personalities, a common trait is a significantly limited variety of facial expressions. Kim Jong-un is no exception.
Consider this thought experiment: Imagine, for a moment, that you had never heard of the DPRK leader. You would very likely think Kim Jong-un's 'smile' is a good one. You may think it to be a sincere smile - yet you'd be wrong. His 'smile' is a feigned. It's quite insincere.
Included here are three examples of one of Kim Jong-un's default expressions - a false-smile. He displays a small variety of other default faces - and he's more skilled than most people at reproducing these expressions on-demand. But with such a low variability and routine use of a small number of facial expressions - these are essentially, Living Masks.
Notice that Kim Jong-un's bottom teeth are visible. While the lower teeth are indeed often revealed during sincere laughter, he was not laughing in these examples. A true, sincere smile of joy-happiness never exposes the lower teeth - but, as with most people, the North Korean leader is fond of exposing them when he's feigning a smile.
Fascinatingly, individuals who routinely "wear" behavioral facial masks are not only being insincere in that particular moment - they also exhibit strong insincere behavior over the course of their entire lifetimes'.
Moreover, people who commonly display behavioral masks also have another profound personality flaw - they have a strong tendency to think in false-dichotomy World-views.
Summary: Kim Jong-un's routine display of a small number of facial expressions are examples of behavioral facial masks. Included here three images of one of his default faces - an insincere smile. This low-variety of facial expressions is a pattern common to dictators, tyrants - and sociopaths - as well as those who view the World in false dichotomies.
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See also:
Body Language Analysis No. 4227: Sarah Huckabee Sanders comments regarding Stormy Daniels and President Trump
Body Language Analysis No. 4225: Sam Nunberg Interview - Part I • Roger Stone, Donald Trump, and Russia
Body Language Analysis No. 4223: Donald Trump to Republican Senator, "You're Afraid of the NRA"
Body Language and Medical Analysis No. 4221: Why are Donald Trump's Pupils Intermittently So Large?
Body Language Analysis No. 4205: Chloe Kim, Albert Einstein, and Creativity
Body Language Analysis No. 4198: Lupita Nyong'o, Black Panther, and Attention to Detail
Body Language Analysis No. 4179: Senator Dick Durbin questions Secretary of Homeland Security Kirstjen Nielsen
Body Language Analysis No. 4145: Steve Bannon stumping for Roy Moore (and against Mitt Romney) in Alabama
Body Language Analysis No. 4065: The Murder of Laci Peterson - Scott Peterson's Red Flag
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