There are interesting high level links between China and Brazil. Eg China has helped Brazil’s ex-Foch aircraft carrier refurbishing and Chinese pilots/crew will train on it. China says it will help with nuclear submarines. I suggest there are more Brazilians in Harbin, China than the Brazilian-based aircraft assembly plant needs. Harbin is the design smarts, close to Russia and inland a bit to be away from offshore attackers, for nuke subs.
The President of Brazil has ‘announced’ that they will buy French Rafale fighters, which match the aircraft carrier. If that completes, Brazil will acquire manufacturing tech that China wants, especially in the Rafale jet engines – via a doorway that evades Euro arms embargo on China. Such factors might lead to strong ties.