Mr. Bolsonaro and his aides had criticized President Emmanuel Macron of France, who announced the aid package but who they suggested was actually trying to shield France’s agriculture from Brazilian competition.

But Mr. Bolsonaro said today that if Mr. Macron withdrew “insults made to my person,” and what Mr. Bolsonaro interpreted as insinuations that Brazil did not have sovereignty over the Amazon, he would reconsider.

Go deeper: The widespread fires in the world’s largest rainforest have drawn international outrage, but some locals are indignant at what they see as outsiders trying to decide how Brazilians should steward their land. Farmers say they need fire and deforestation to maintain beef and soy exports, and that the damage done to the rainforest is modest.

Perspective: In an Op-Ed, a former Brazilian official argues that those who live in the Amazon must be given the means to both use and preserve their environment.