Venezuelans hold a protest in the border city of Urena, Tachira, after President Nicolas Maduro's government ordered a temporary close-down of 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 JUAN BARRETO / AFP)