Six nations made the unprecedented move Wednesday of asking the U.N.’s International Criminal Court to investigate Venezuela for possible crimes against humanity, even as President Nicolas Maduro made an unexpected trip to the world body’s headquarters to deliver a nearly hourlong speech declaring his nation “will never give in.”

Maduro’s speech at the General Assembly gathering of world leaders came hours after Argentina, Chile, Colombia, Peru, Paraguay and Canada formally asked the ICC to investigate Venezuela on a range of possible charges, from murder to torture and crimes against humanity.

“To remain indifferent or speculative in front of this reality could be perceived as being complicit with the regime. We are not going to be complicit,” said Paraguayan Foreign Minister Andres Rodriguez Pedotti.

The six countries hope the move puts new pressure on Maduro to end the violence and conflict that have sent more than 2 million people fleeing and made Venezuela’s inflation and homicide rates among the highest in the world.

Venezuelan officials have widely rejected international criticism, saying they’re driven by imperialist forces led by the U.S. to justify launching an invasion. And Maduro sounded a defiant tone Wednesday night, complaining that Washington was attacking his country through sanctions and other means and strong-arming other countries into going along in a “fierce diplomatic offensive.”

“The U.S. wants to continue just giving orders to the world as though the world were its own property,” Maduro said. “Venezuela will never give in.”

But at the same time, he said he was willing to talk with Trump.

Wednesday marked the first time that member countries have referred another country to the Netherlands-based U.N. court.

Canada was among nations referring Venezuela to the ICC, and Prime Minister Justin Trudeau seized the moment to defend the idea of global justice the court represents — the day after Trump attacked it in a stinging speech that challenged multilateral organizations.

Its chief prosecutor, Fatou Bensouda, already has opened a preliminary investigation into allegations that Venezuelan government forces since April 2017 “frequently used excessive force to disperse and put down demonstrations,” and abused some opposition members in detention.