Venezuela may have the world's biggest oil reserves, but the common practice of smuggling supplies across to neighbouring Colombia, where it sells for many times more, has triggered a massive shortage internally.

And what's more, the country's oil production has slowed to a trickle, so it must now import fuel. But getting around the latest US economic sanctions is proving difficult.

Al Jazeera's Lucia Newman has more from the border city of San Cristobal.

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