After Sunday's acts of vandalism in places of power by supporters of ex-president Jair Bolsonaro, calm has returned to Brasilia.

How to avoid this kind of riots?

According to Carlos Milani, professor of international relations at the State University of Rio de Janeiro (IESP-UERJ), researcher at the National Council for Scientific and Technological Development (CNPq), guest of France 24, "the second challenge for Lula da Silva is to become a leader of the National Union".

Decryption.