Most of the real work at Davos takes place away from cameras, says CNN's John Defterios. There was an awful lot of discussion about what China's reopening means, he adds. And I think amongst the political leaders who were here, a lot of conversation about and actually a lot of questioning of Germany's reluctance to supply tanks. "This is all timely, useful conversation," defterios writes. 'If you didn't have something like Davos, you would probably want to invent it'