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The election of Donald Trump brought disarray to the climate change regime. The changes in what was up to then a promoter of the liberal international order (LIO) exacerbated existing tensions while creating new ones. This paper investigates how that challenge impacted the behaviours of Brazil, China and the European Union (EU) by comparatively analysing their dissimilar positions with respect to three indicators before and after Trump's coming into power. These indicators are individual pledges and climate-related policies; approaches to climate finance; and the principle of common but differentiated responsibilities and respective capabilities (CBDR-RC). The analysis first shows how the US started eroding the broader LIO and the climate change regime to then delve into the behaviours of the three respective key players concerning climate talks. I sustain that the EU, despite its inner divisions, is already counteracting Washington, whereas China is combining a pro-status quo position based on a rhetorical condemnation of the United States. Brazil, in turn, had a transition towards a climate-sceptic government, shifting from being a cooperative actor to abdicating hosting the COP25. [ABSTRACT FROM AUTHOR]