A man walks past a poster of ETA leader Jose Antonio Urrutikoetxea, known as Josu Ternera, following a demonstration in his home town of Ugao-Miravalles, Spain, May 16, 2019. REUTERS/Vincent West

Supporters of ETA leader Jose Antonio Urrutikoetxea, known as Josu Ternera, take part in a demonstration behind a banner reading "Free Josu. Don't attack the solution", in his home town of Ugao-Miravalles, Spain, May 16, 2019. REUTERS/Vincent West

Supporters of ETA leader Jose Antonio Urrutikoetxea, known as Josu Ternera, take part in a demonstration behind a banner reading "Free Josu. Don't attack the solution", in his home town of Ugao-Miravalles, Spain, May 16, 2019. REUTERS/Vincent West

Supporters of ETA leader Jose Antonio Urrutikoetxea, known as Josu Ternera, take part in a demonstration behind a banner reading "Free Josu. Don't attack the solution", in his home town of Ugao-Miravalles, Spain, May 16, 2019. REUTERS/Vincent West

Supporters of ETA leader Jose Antonio Urrutikoetxea, known as Josu Ternera, take part in a demonstration behind a banner reading "Free Josu. Don't attack the solution", in his home town of Ugao-Miravalles, Spain, May 16, 2019. REUTERS/Vincent West

A convoy transporting Basque separatist group's ETA kingpin Josu Ternera is pictured out of the Palais de Justice in Bonneville, France May 16, 2019. REUTERS/Denis Balibouse

A convoy transporting Basque separatist group's ETA kingpin Josu Ternera is pictured out of the Palais de Justice in Bonneville, France May 16, 2019. REUTERS/Denis Balibouse

Basque separatist group's ETA kingpin Josu Ternera is escourted out of the Palais de Justice in Bonneville, France May 16, 2019. REUTERS/Denis Balibouse

Basque separatist group's ETA kingpin Josu Ternera is escourted out of the Palais de Justice in Bonneville, France May 16, 2019. REUTERS/Denis Balibouse

Basque separatist group's ETA kingpin Josu Ternera is escourted out of the Palais de Justice in Bonneville, France May 16, 2019. REUTERS/Denis Balibouse

A sign is pictured on the Gendarmerie Nationale of the Hospital where Basque separatist group's ETA kingpin Josu Ternera was being held before a transfer to Bonneville in Sallanches, France May 16, 2019. REUTERS/Denis Balibouse

A sign is pictured on the Gendarmerie Nationale of the Hospital where Basque separatist group's ETA kingpin Josu Ternera was being held before a transfer to Bonneville in Sallanches, France May 16, 2019. REUTERS/Denis Balibouse

A sign is pictured at the entrance of the Hospital where Basque separatist group's ETA kingpin Josu Ternera was arrested in Sallanches, France May 16, 2019. REUTERS/Denis Balibouse

A sign is pictured at the entrance of the Hospital where Basque separatist group's ETA kingpin Josu Ternera was arrested in Sallanches, France May 16, 2019. REUTERS/Denis Balibouse

A sign is pictured at the entrance of the Hospital where Basque separatist group's ETA kingpin Josu Ternera was arrested in Sallanches, France May 16, 2019. REUTERS/Denis Balibouse

A sign is pictured at the entrance of the Hospital where Basque separatist group's ETA kingpin Josu Ternera was arrested in Sallanches, France May 16, 2019. REUTERS/Denis Balibouse

Spanish Prime Minister Pedro Sanchez and French Prime Minister Edouard Philippe pose with a copy of ETA confiscated documents during an event to acknowledge both countries' collaboration in the fight against terrorism at Moncloa Palace in Madrid, Spain October 1, 2018. REUTERS/Susana Vera

A man holds a sign that reads "No ETA + Independentists. Government with ballot boxes" during a protest calling for general elections in response to the investiture of Pedro Sanchez as new Spanish Prime Minister after winning a motion of no confidence vote, at Plaza Colon Square in Madrid, Spain, June 3, 2018. REUTERS/Susana Vera

Walkers pass graffiti reading "Kalera" (To the Street) in support of ETA prisoners, three days after militant Basque separatists ETA announced their dissolution, in Guernica, Spain, May 6, 2018. REUTERS/Vincent West

A municipal worker removes graffiti reading "ETA, Thanks" two days after militant Basque separatists ETA announced their dissolution, in Bilbao, Spain, May 5, 2018. REUTERS/Vincent West

A municipal worker removes graffiti reading "ETA, Thanks" two days after militant Basque separatists ETA announced their dissolution, in Bilbao, Spain, May 5, 2018. REUTERS/Vincent West

A municipal worker removes graffiti reading "ETA, Thanks" two days after militant Basque separatists ETA announced their dissolution, in Bilbao, Spain, May 5, 2018. REUTERS/Vincent West

Graffiti reading "ETA, Thanks." Is displayed on a wall two days after militant Basque separatists ETA announced their dissolution, in Bilbao, Spain, May 5, 2018. REUTERS/Vincent West

Refuse collectors ride past graffiti reading "ETA, Thanks." two days after militant Basque separatists ETA announced their dissolution, in Bilbao, Spain, May 5, 2018. REUTERS/Vincent West

People wave Basque flags near the International Event to Advance in the Resolution of the Conflict in the Basque Country, following armed Basque separatists ETA's announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, talk after a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, embrace after a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, take part in a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, take part in a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, take part in a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, take part in a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, take part in a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Uxue Barkos, regional premier of Navarra, and Inigo Urkullu, Lehendakari (premier) of the Basque Country, take part in a joint declaration following armed Basque separatists ETA's announcement of their dissolution in Bertiz, Navarra, Spain, May 4, 2018. REUTERS/Vincent West

Jonathan Powell delivers the Arnaga Declaration alongside Cuauhtemoc Cardenas, Irati Agorria Cuevas, Bertie Ahern, Anaiz Funosas and Gerry Adams at the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-Les-Bains, France May 4, 2018. REUTERS/Vincent West

(L-R) Cuauhtemoc Cardenas, Jonathan Powell, Irati Agorria Cuevas, Michel Camdessus, Bertie Ahern, Anaiz Funosas and Gerry Adams arrive to deliver the Arnaga Declaration at the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-Les-Bains, France May 4, 2018. REUTERS/Vincent West

(L-R) Cuauhtemoc Cardenas, Jonathan Powell, Irati Agorria Cuevas, Michel Camdessus, Bertie Ahern, Anaiz Funosas and Gerry Adams arrive to deliver the Arnaga Declaration at the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

(Back L-R) Jonathan Powell, Bertie Ahern, Gerry Adams (Front L-R) Cuauhtemoc Cardenas, Irati Agorria Cuevas, Michel Camdessus and Anaiz Funosas arrive to deliver the Arnaga Declaration at the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

Jonathan Powell delivers the Arnaga Declaration alongside Cuauhtemoc Cardenas, Bertie Ahern, Anaiz Funosas and Gerry Adams at the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

Cuauhtemoc Cardenas delivers the Arnaga Declaration alongside Bertie Ahern, Michel Camdessus, Jonathan Powell, Anaiz Funosas and Gerry Adams at the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution, in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Basque nationalist politicians Arnaldo Otegi and Andoni Ortuzar arrive to the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

Spain's Prime Minister Mariano Rajoy arrives to deliver a speech regarding the dissolution of Basque separatist group ETA at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

Spain's Prime Minister Mariano Rajoy delivers a speech at the Moncloa Palace in Madrid, Spain, May 4, 2018. REUTERS/Sergio Perez

(Front L-R) Lawyer Brian Currin, greets former Downing Street advisor on Northern Ireland Jonathan Powell, alongside Mayor of Bayonne Jean Rene Etchegary before the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

(L-R) Organizers Agus Hernan, Brian Currin and Anaiz Funosas talk during the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

(Front L-R) Lawyer Brian Currin greets former Irish Prime Minister Bertie Ahern alongside Mayor of Bayonne Jean Rene Etchegary before the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

(L-R) Politicians Pello Urizar, Maddalen Iriarte, lawyer Brian Currin, Basque politician Arnaldo Otegi, Mayor of Bayonne Jean Rene Etchegary and politician Andoni Ortuzar gather before the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution, in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

(Front L-R) Lawyer Brian Currin, Northern Irish politician Gerry Adams and Mayor of Bayonne Jean Rene Etchegary gather before the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

(Front L-R) Lawyer Brian Currin, Northern Irish politician Gerry Adams and Mayor of Bayonne Jean Rene Etchegary gather before the International Event to Advance in the Resolution of the conflict in the Basque Country, following Armed Basque separatists ETA announcement of their dissolution in Cambo-les-Bains, France May 4, 2018. REUTERS/Vincent West

Mapa que localiza las prisiones que abrigan miembros de ETA encarcelados. 15 cm de ancho. (SGN09)

Basque premier Inigo Urkullu returns to his seat after a speech at the Palacio Euskalduna following the announcement by armed Basque separatists ETA of their full dissolution, in Bilbao, Spain, May 3, 2018. REUTERS/Vincent West

Basque premier Inigo Urkullu delivers a speech at the Palacio Euskalduna following the announcement by armed Basque separatists ETA of their full dissolution, in Bilbao, Spain, May 3, 2018. REUTERS/Vincent West

Basque premier Inigo Urkullu delivers a speech at the Palacio Euskalduna following the announcement by armed Basque separatists ETA of their full dissolution, in Bilbao, Spain, May 3, 2018. REUTERS/Vincent West