More than 10 million people have had power cut to their homes and businesses across Cuba after the country's national electrical grid collapsed for the second time in a week. Cuba's energy ministry said "a total disconnection of the National Electrical System has occurred", in a social media statement. Cuba's grid operator UNE said it was gradually recovering electricity, prioritising "vital" centres including hospitals and water systems. By Sunday afternoon, power had been restored to about half of Havana, according to its electricity company. The Caribbean country has suffered three major blackouts this month as a US fuel blockade cuts off foreign oil imports, required to keep power stations running. The Communist-run country has an ageing electricity infrastructure and chronic fuel shortages. A coalition of international socialist groups arrived in Havana over the weekend to show their support for the Cuban government, bringing with them aid donations of solar panels, basic food kits and medicines.…