Miguel Díaz-Canel told crowds in Havana the US is attempting to break down Cuba’s political system.
He declared Washington wants full control across the nation.
Díaz-Canel described American policies a case of political genocide during July 26 events.
He warned this is a danger to Cuba’s sovereignty.
Raúl Castro was absent from the main rally.
Tensions are elevated as a result of sanctions and American political pressure.