Venezuelan President Nicolas Maduro warned on Thursday that a deal with the political opposition for elections to be held later this year was in danger of collapse, after what he has described as “conspiracies” against him.

Last year, the government of Maduro’s ruling socialists reached a deal with the political opposition over talks in Barbados to hold elections sometime during the second half of this year.

The deal caused the United States to temporarily ease economically debilitating oil sanctions on the crude-exporting country.

U.S. officials stressed that the relief was dependent on Caracas lifting bans on opponents holding public office, as well as releasing political prisoners and “unjustly detained” Americans.

Venezuela has yet to lift a ban on Maria Corina Machado, the opposition’s presidential candidate.

This week, Maduro said “conspiracies” against him and high-ranking government officials were dismantled last year, with nearly three dozen civilians and military personnel detained.

Later, U.S. officials said they were “concerned” about the arrests, which included members of the political opposition.

“Today the Barbados agreements are mortally wounded, they’re in intensive care, they were stabbed, kicked,” Maduro said in a televised state broadcast.

“Hopefully we can save the Barbados agreements and, through dialogue, reach real overarching agreements through national consensus,” he added.

The government’s arrest of opposition members could put the agreements at risk, and cause the sanctions to snap back. The arrest of opposition figures also threatens Machado’s electoral chances, after she formed an alliance on Tuesday to mobilize her campaign.

-Reuters