The head of U.S. Southern Command says military officials are focusing on preparing for “the day after” once “isolated” Venezuelan President Nicolás Maduro leaves power.

Axar.az reports citing Military times that Navy Adm. Craig Faller warned Monday against Venezuela’s “formidable weapon system” and criticized Cuba, Russia, and China for assisting Maduro, saying it was important to put “continuous pressure” on the “illegitimate regime” and organize humanitarian efforts.

Faller also shared concerns about the growing influence of China in Brazil. China is the South American country’s largest foreign investor.

The commander is in Rio de Janeiro for a multinational maritime exercise this month that partly aims to better coordinate the response to cyberwar threats and natural disasters.