STORY: Pumps have gone dry in Havana, as Cuba completely runs out of diesel and fuel oil amid a U.S. blockade.

That's according to the country's energy and mines minister, Vicente de la O Levy, who said Wednesday on state television that the national grid was in a "critical" state:

"The volumes involved in fuel consumption for electricity generation are in the millions of tons across the different types -- the sum of the different types of fuel: crude oil, fuel oil, of which we have absolutely none; diesel, of which we have absolutely none -- I am repeating myself. The only thing we have is gas from our wells, where production has grown."

Blackouts have increased across Havana, prompting protests in multiple neighborhoods by residents who are tired of going up to 22 hours a day without power.

Cuba says it is 'open to anyone who wants to sell' it fuel, but U.S. President Donald Trump has deterred other nations from sending oil to Cuba with the threat of tariffs.

Only one large tanker, a Russian-flagged vessel, has delivered crude to Cuba since, arriving at the island in April.

Though the country has installed a lot of solar power in recent years, that too is hit by failures in the national grid.

Havana's energy emergency comes as the U.S. blockade on fuel imports enters its fourth month, crippling public services across the Caribbean island of nearly 10 million people.

The United Nations last week called Trump's blockade unlawful, saying it had obstructed the "Cuban people's right to development" and "undermined" their basic rights.