The cause is being investigated as restoration efforts are underway.

The national electrical system of Cuba suffered a total disconnection at 11 a.m. local time after a power plant failed, the Cuban Ministry of Energy and Mines said.

It's the second such visit in recent months after U.S. officials tracked four Russian warships arriving in Cuba last month.

The Pentagon is downplaying the arrival of four Russian Navy ships in Cuba although U.S. Navy ships shadowed them as they made their way to Havana.

ABC News’ Martha Raddatz has the latest on the Russian warships conducting military exercises 100 miles off the Florida coast.

Manuel Rocha is set to formally change his plea and face sentencing in April.

The Cuban embassy staff "suffered no harm," and "details are being worked out," Foreign Affairs Minister Bruno Rodríguez Parrilla said.

A Cuban rapper, who helped write the 2021 Latin Grammy song of the year, sewed his own mouth shut to protest his alleged mistreatment in prison.

The Cuban Foreign Ministry called the stop of a US nuclear-powered submarine at the US naval base at Guantanamo Bay a "provocative escalation" on Tuesday.

ABC News’ Matt Rivers reports on the ground from Haiti as violent gangs, disease and hunger deepen a humanitarian crisis and threaten the future of the country.

Two Cuban migrants landed at Key West International Airport on a motorized hang glider Saturday morning, authorities said.

The duo landed at Key West International Airport and were turned over to U.S. border patrol for processing.

A former U.S. defense intelligence agency analyst convicted of spying for Cuba was released from federal prison on Friday, prison officials confirmed with ABC News.

Jaqueline Charles, Caribbean correspondent for the Miami Herald, explains the challenges Haiti faces, as the United Nations struggles to find a helpful solution.

Cuba is recovering from extensive damage and widespread power outages in the wake of Hurricane Ian.

A deadly fire that began at a large oil storage facility in western Cuba has spread, threatening to plunge the island into a deeper energy crisis as it forced officials to shut down a key plant.

The deal is pending approval by the Cuban government but could open the door for additional American dollars flowing to entrepreneurs in the island nation.

An explosion caused by an apparent gas leak killed at least eight people and injured dozens more at a 5-star hotel in downtown Havana.

Twenty-six people are dead, including four minors, from an explosion at a hotel in Havana, Cuba, apparently caused by a gas leak.

A gas leak is suspected as the cause of the blast at Hotel Saratoga in the Old Havana neighborhood.

ABC News’ Marcus Moore reports on the latest developments in the kidnapping of American missionaries in Haiti and the ransom demand of $17 million for their release.

Linsey Davis speaks with ABC News contributor and former senior FBI official Richard Frankel on how U.S. officials might negotiate with the Haitian gang to release the 16 American missionaries.

The Haitian government said they suspect the 400 Mazowo gang is responsible for the kidnapping of the missionaries.

An urgent effort is underway by U.S. officials to rescue 17 members of an Ohio-based Christian organization who were kidnapped Saturday by a gang in Haiti.

Former Deputy Assistant Secretary of State Stephen T. Ganyard discusses the consequences of the kidnapping and the current crises Haiti is facing.

The gang in Haiti is suspected of holding 16 U.S. citizens -- including five children -- and one Canadian, and is reportedly demanding $1 million in ransom for each person.

ABC News' Linsey Davis speaks with Cuba’s ambassador to the UN Yuri Gala on last month's protests in Cuba amid economic hardships, and the Cuban government’s crackdown.

In his first steps toward his own Cuba policy, President Joe Biden is sanctioning the Cuban defense minister and its special forces.

Anti-government protesters in Cuba say the COVID-19 pandemic has exacerbated long-standing issues about food, electricity and basic goods in the country.

In Miami, Cuban Americans took to the streets for a third day and blocked a highway for hours demanding the U.S. take action to support demonstrators in Cuba.

Cuban President Miguel Diaz-Canel blames the U.S. embargo for food and fuel shortages that sparked unprecedented demonstrations across the island.

ABC News’ Linsey Davis speaks with "Belly of the Beast" journalist Reed Lindsay on the outbreak of protests in Cuba as tensions boil over amid a worsening economic crisis.

Thousands of people took to the streets in Cuba and Miami to protest shortages in food and medicine as the island nation battles COVID-19.

President Joe Biden responded to the largest protests the island has seen in nearly three decades, saying the calls for freedom “must be respected.”

Plus, Texas lawmakers battle over voting rights in a special session, and the delta variant fuels surge in COVID-19 cases as students prepare to go back to school.

President Joe Biden on Monday released a statement in solidarity with the people of Cuba who marched on the island Sunday to protest leadership amid the pandemic.

Thousands of people marched across the island Sunday to protest the lack of freedoms and worsening economic conditions.

Plus, Haitian authorities have arrested a man with Florida ties and accused him of playing a major role in the assassination of President Jovenel Moise. ABC News’ Andrew Dymburt has more.

Trump is further tightening his administration's pressure campaign against Cuba as it unravels the historic opening implemented by his predecessor Barack Obama.

The only communist state in the west is at a standstill.

The administration announced new steps to restrict Americans' travel to Cuba.

The Jazz at Lincoln Center tour director says bans could affect musicians who want to exchange ideas with Cubans.

National Security Adviser John Bolton announced a slew of sanctions against Cuba, Venezuela and Nicaragua Wednesday.

The Trump administration will be the first to allow lawsuits under a 23-year-old law.

Upping pressure on Cuba, Secretary of State Mike Pompeo announced Wednesday the Trump administration will allow lawsuits against companies using confiscated property.

U.S. diplomatic personnel residing in Cuba's capital who felt ill after hearing loud, high-pitched sounds or feeling pressure sensations suffered damage to the inner ear.

"Objective testing showed evidence of a balance disorder that affects the inner ear and a unique pattern of cognitive and behavioral dysfunction," said Dr. Michael Hoffer.

Cuban citizens will now have internet access on their cellphones.

Cuban citizens are now able to access the internet on their phones for the first time.

The bank was charged with conspiring to violate the Trading with the Enemy Act.