The situation for those living in Cuba is growing more dire by the day as the island grapples with dwindling oil supplies to fuel everyday life, experts on Cuban-U.S. relations told ABC News.On Thursday, the U.S. embassy in Cuba issued a security alert about the country's worsening power crisis -- stating that the national electrical grid "is increasingly unstable."Prolonged power outages, both scheduled and unscheduled, have been occurring daily across the island, including in the capital city of Havana, U.S. officials say. The outages are impacting water supply, lighting, refrigeration and communications.A shortage of fuel is also affecting transportation and...