The US Embassy in Cuba has warned Americans in the country that there is a wave of government-backed protests against Washington and that some US citizens have been denied entry to the country upon arrival, Reuters reported, quoted by BTA.
It was also stated that US citizens in Cuba should prepare for "significant disruptions" from power outages and fuel shortages.
In recent weeks, Washington has taken steps to block oil supplies to Cuba, including from Venezuela, which has led to rising food and transportation prices and caused severe fuel shortages and hours of power outages.
"Take precautions by conserving fuel, water, food, and cell phone power, and be prepared for significant disruptions," the US embassy notes on its website, noting that Cuba's national electrical grid is increasingly unstable and prolonged power outages are a daily occurrence.
"American citizens in Cuba or planning to travel to Cuba are advised that there have been cases of American citizens being denied entry upon arrival, as well as a surge in regime-backed protest actions directed at the United States, including anti-American rhetoric."
Encouraged by the capture of ousted Venezuelan leader Nicolas Maduro by the US military during a raid last month on the orders of the US President, Donald Trump spoke of actions against Cuba and pressure on its leadership.
The UN human rights office said the US operation that detained Maduro was a violation of international law, and human rights experts described Trump's focus on exploiting Venezuelan oil as "reflecting an imperialist approach", Reuters reported.
Trump said "Cuba will soon go bankrupt", adding that Venezuela, once the island's largest supplier, has not recently sent oil or money to Cuba. Trump also threatened tariffs on goods from countries that supply oil to Cuba.
Cuba's deputy foreign minister told Reuters on Monday that Havana and Washington were in contact, although he noted that the exchange had not escalated into a formal "dialogue".