Mixed signals': Putin-Trump meeting deconstructed

What are the "tells" when two of the world's most powerful leaders meet? A British expert found mixed signals in the body language of Donald Trump and Vladimir Putin today.

British behavioural psychologist Peter Collett found both dominance and vulnerability among the tell-tale signs shown by the Russian and US presidents ahead of their talks in Helsinki.

"It's not as though one is trying to lord it over the other and the other is being obsequious... What we have is the two men producing mixed signals," Collett said. "Neither of them appear at ease in each other's presence," he said.

Here are some of the key giveaways from the pair's meeting in front of the cameras, according to Collett:
"He seems to make a habit of not imposing himself physically on Putin, out of respect for the man whom he considers equal and whom he's very eager to mollify and please."
"We pucker our chin when we unconsciously feel we're going to be attacked... It's a vulnerability tell."