Venezuela’s opposition said on Sunday a dialogue mediated by Norway’s Foreign Ministry to try to resolve the country’s political crisis had ended, six weeks after President Nicolas Maduro’s government suspended participation. The talks, most of which had taken place on the Caribbean island of Barbados, began after opposition leader Juan Guaido led a failed military uprising in April against Maduro, who is accused of human rights violations and has overseen an economic collapse that has prompted millions to flee. Maduro’s representatives walked away from the table in August to protest U.S. President Donald Trump’s tightening of sanctions on the OPEC nation. Critics of the dialogue within Venezuela’s opposition coalition argued that Maduro was negotiating in bad faith and used the talks to buy time. “The dictatorial regime of Nicolas Maduro abandoned the negotiation process with false excuses,” Guaido’s office said in a statement posted on Twitter. “After more than 40 days in which they have refused to continue, we confirm that the Barbados mechanism is finished.”