Venezuelan citizens stand at the Simon Bolivar bridge, in Cucuta, Colombia after President Nicolas Maduro's government ordered to temporary close down the border with Colombia on February 23, 2019. - Venezuela braced for a showdown between the military and regime opponents at the Colombian border on Saturday, when self-declared acting president Juan Guaido has vowed humanitarian aid would enter his country despite a blockade. (Photo by Luis ROBAYO / AFP)