Garbage is piling up on street corners in the Cuban capital of Havana, attracting hordes of flies and reeking of rotten food in one of the most visible impacts of the U.S. bid to prevent oil from reaching the Caribbean's largest island.

The state-run news outlet Cubadebate reported this month that in Havana only 44 of 106 of its rubbish trucks could operate due to fuel shortages, slowing garbage collection.

Cardboard boxes, used bags, plastic bottles, and rags piled up on street corners across the seafront capital, as some residents sorted through the waste looking for scraps they could reuse, while motorists, pedestrians, and bikers must circumvent the imposing heaps.

"It's all over the city," said local resident Jose Ramon Cruz. "It's been more than 10 days since a garbage truck came."

In other towns on the island — home to around 11 million people — residents took to social media to warn of the risks to public health.

Cuba's government has implemented rationing measures to protect essential services in the country that was already suffering from severe shortages of food, fuel, and medicine.

The country's oil supply has fallen off dramatically in two months.

Venezuela — once Cuba's top supplier — effectively stopped sending shipments in mid-December.

Mexico's government also said it was halting shipments after Washington threatened tariffs against countries that send supplies to Cuba.

A Russian newspaper last week reported that Moscow was preparing to send crude and fuel cargoes to the communist-run island in the near future, without giving a specific date.

The U.S. has maintained an embargo on Cuba since the 1960s, but in recent months the administration of President Donald Trump has hardened its stance, sanctioning vessels shipping oil to Cuba and threatening tariffs on suppliers.

It argues the measures will pressure political change in Cuba.

The United Nations has long voted for the U.S. to end its embargo, and leaders from Mexico and Venezuela said blocking fuel could have serious humanitarian impacts.