The “Iron and Blood Observing the World” account on the Chinese Bilibili video platform posted a video titled “"A Giant Radar Was Discovered in Cuba, Monitoring Most of the U.S. - The Pentagon: The Chinese Did It!" 

The video shows satellite images of a large radar station in Cuba that reportedly has discovered by the Pentagon. The narrator explains that the radar station is powerful enough to cover more than half of the United States, that it is too large to have been built by Cuba, and that the history of China-Cuba relations and U.S.-Cuba relations suggests that it belongs to China. 

He also says that the radar has been used to monitor U.S. missile launches, and that the only way for the U.S. to eliminate the radar station would be through military means.