At the end we are all humans/animals. Under pressure and during nervous situations, even the best cannot hide their natural body language.
I recommend you to turn off the volume on this video and just pay attention at the body language of the politicians at this round table: http://www.euronews.com/2014/10/17/kremlin-ukraine-talks-full-of-misunderstandings-and-disagreements/
See how Putin nervously makes random, unnecessary movements and how Poroshenko has his hands in a strategical place, a common signal for a need to protect oneself. Also the crossed arms of Merkel and chattering of Matteo Renzi.