President Donald Trump and America's top diplomat have again raised the spectre of US military intervention in Cuba, a renewed threat that takes on greater weight a day after the administration announced criminal charges against the island's former leader, Raúl Castro.

The possibility that the Justice Department could indict former Cuban leader Raúl Castro is pushing U.S. relations with the communist-run island to the foreground.

As U.S. President Donald Trump appears poised to announce criminal charges against 94-year-old former Cuban president Raul Castro, analysts say it's likely a symbolic move…