Warning comes as US threatens tariffs on any country that supplies oil to the Caribbean island.
United Nations Secretary-General Antonio Guterres has warned of a humanitarian âcollapseâ in Cuba if its energy needs go unmet after the United States moved to block all oil from reaching the Caribbean island and threatened tariffs on any nations that step in to help.
The warning on Wednesday came amid a severe fuel shortage in Cuba that has prompted hours of blackouts, even in the capital Havana, as well as a surge in prices for food and transportation.

Stephane Dujarric, a spokesman for Guterres, told reporters in New York that the UN chief was âextremely concerned about the humanitarian situation in Cubaâ, which he said will âworsen if not collapse, if its oil needs go unmetâ.
Dujarric also noted that for more than three decades, the UN General Assembly, too, has consistently called for an end to the trade embargo imposed by the US on Cuba.
âThe secretary-general urges all parties to pursue dialogue and respect for international law,â he added.
The US and Cuba have been foes since the Cuban revolution of 1959, when Fidel Castro took power, and his socialist government nationalised US-owned businesses. Washington responded with economic sanctions that were tightened into a full embargo in 1962.

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The Caribbean island has long been in the grip of an economic crisis and had relied on Venezuela for its oil until US forces abducted Venezuelan President Nicolas Maduro in a raid on his residence in Caracas last month.
US President Donald Trump subsequently claimed control of Venezuelan oil and promised to starve Cuba of the commodity. He has labelled Cuba âan unusual and extraordinary threatâ to the US, and said he wants to âmake a dealâ with Cubaâs leadership, without saying what an agreement might look like.
Trump has also threatened tariffs on any other nation stepping in to help, prompting worry in Mexico, which is currently the islandâs main supplier of oil.
Mexican President Claudia Sheinbaum said on Tuesday that her country was using all diplomatic avenues to ensure crude shipments to Cuba. She, too, warned of a humanitarian crisis in Cuba but said she did not want to put her own country âat risk in terms of tariffsâ.
âWeâre looking at the scopeâ of Trumpâs threatened tariffs, âand weâre using all diplomatic channelsâ, she told reporters.
Sheinbaum added that Mexico would send humanitarian aid to Cuba this week and was seeking an agreement with Washington that would allow it to also send oil. âThere is still no agreement on this,â she said.
Cubaâs President Miguel Diaz-Canel slammed Trumpâs tariff threat last week, saying the US leader was planning âto suffocateâ Cubaâs economy under a âfalse and baseless pretextâ. The country also declared an âinternational emergencyâ saying Trumpâs move constitutes âan unusual and extraordinary threatâ.
According to The Financial Times, Mexico supplied some 44 percent of Cubaâs oil imports, and Venezuela supplied 33 percent until last month. About 10 percent is also sourced from Russia and a smaller amount from Algeria, it said.
The British newspaper also cited the Kpler data company as reporting on January 30 that Cuba only has enough oil to last 15 to 20 days at current levels of demand.
The US embassy in Cuba, meanwhile, warned Americans in the country on Tuesday to prepare for âsignificant disruptionâ from power outages â and fuel shortages.
Cubaâs Deputy Foreign Minister Carlos Fernandez de Cossio told âthe Reuters news agency on Monday that Cuba and the US are in communication, although he noted the exchanges have not evolved into formal âdialogueâ.