Opposition leader Juan Guaido, recognized by some 50 countries as Venezuela's interim president, warned the military Sunday that blocking humanitarian aid from entering the country is a "crime against humanity."

The United States has presented a draft resolution at the United Nations Security Council calling for international aid deliveries and a presidential vote in Venezuela, triggering a Russian counter-proposal.

Desperately needed aid being stockpiled at Venezuela's door is at the heart of a political duel between the two men fighting to lead the oil-rich nation: Juan Guaido and Nicolas Maduro.

Opposition leader Juan Guaido is challenging President Nicolas Maduro for control of crisis-hit Venezuela, a country plagued by hyperinflation, shortages of basic necessities and rampant violence.

Nieves Ribullen, a Venezuelan oil worker sick of struggling to get by as his country falls apart, is betting it all on far-away Iraq's Kurdish region to give his family a better life.

Over the years he's watched dozens of co-workers abandon poverty wages and dangerous working conditions at the rundown complex of refineries in Punto Fijo on Venezuela's Caribbean coast for jobs in far-flung places like Kuwait, Angola and Chile.

Yajaira Gonzalez cries as she gathers with hundreds of other Venezuelans across the Colombian border from her homeland.

Russia said Thursday it had "counted on" being invited to an international dialogue in Montevideo on Venezuela's political crisis, but was told it could not participate. 

European and Latin American envoys were set to gather in the Uruguayan capital Thursday for the first meeting of a "Contact Group" with the goal of creating conditions for a peaceful political process.  

Venezuelan military officers blocked a bridge on the border with Colombia ahead of an anticipated humanitarian aid shipment Tuesday, as opposition leader Juan Guaido stepped up his challenge to President Nicolas Maduro's authority.

International clamor for snap elections in Venezuela intensified as European powers recognized opposition chief Juan Guaido as interim leader, after President Nicolas Maduro rejected an ultimatum to call early voting.

The Lima Group of Latin American countries and Canada called Monday for a peaceful change in government in Venezuela, without military intervention.