Catalan leader Carles Puigdemont leaves the jail of Sassari, in Sardinia, Italy, on Friday. Gloria Calvi/AP hide caption
Carles Puigdemont
Member of European Parliament Carles Puigdemont prepares for an interview in Brussels. The lawyer for Puigdemont says the former Catalan leader has been detained in Sardinia, Italy. Francisco Seco/AP hide caption
The trial of former Catalan leaders for their roles in the failed independence referendum of 2017 began on Tuesday. Emilio Naranjo/Pool/Getty Images hide caption
Newly appointed Catalan leader Quim Torra (center) and other Catalan officials at Torra's ceremonial swearing-in on Thursday. Torra avoided promising to obey the constitution. Alberto Estévez/AFP/Getty Images hide caption
Deposed leader of Catalonia's pro-independence party Carles Puigdemont photographed ahead of his lecture at the University of Helsinki, Finland on Friday. His lawyer said he was detained over the weekend after crossing into Germany. Markku Ulander/AP hide caption
Ousted Catalan leader Carles Puigdemont — seen here in December in Brussels, where he is in exile — said Friday he no longer will pursue his bid for a second term in office. Jasper Juinen/Getty Images hide caption
Demonstrators support former Catalan President Carles Puigdemont in front of the regional parliament in Barcelona on Tuesday. Puigdemont, who fled to Belgium to avoid arrest for leading a secession bid, is facing possible charges of rebellion, sedition and misuse of public funds and faces arrest if he returns from Brussels. Alex Caparros/Getty Images hide caption
Catalan separatist leader Carles Puigdemont arrives at Copenhagen Airport in Denmark on Monday, Jan. 22, 2018. On the same day, his name was put forth to return as Catalonia's president. Scanpix Denmark/Reuters hide caption
Ousted Catalan President Carles Puigdemont speaks at a press conference in Belgium last month, after a snap election in Catalonia gave pro-independence factions a slim majority in the regional parliament. Emmanuel Dunand/AFP/Getty Images hide caption
Ousted Catalan leader Carles Puigdemont (center) is seen in Belgium last month, where he has been living in exile since October. On Tuesday, a Spanish judge withdrew the international warrant for Puigdemont's arrest. Emmanuel Dunand/AFP/Getty Images hide caption
Ousted Catalan leader Carles Puigdemont has turned himself in to police in Brussels, following an international warrant for his arrest over Catalonia's attempt to secede from Spain. Getty Images hide caption
A banner reading "Freedom to political prisoners" hangs from City Hall in Barcelona as a protester waves a Catalan pro-independence Estelada flag during a demonstration on Friday to protest the detention of Catalan officials. Josep Lago/AFP/Getty Images hide caption
Catalonia's deposed leader, Carles Puigdemont (center), speaks at a news conference in Brussels on Tuesday with other members of his dismissed government. Aurore Belot/AFP/Getty Images hide caption
Some people unfold a Spanish flag as another man waves a Catalan pro-independence flag in front of the Catalan government headquarters in Barcelona on Monday. Spain enters uncharted and potentially perilous territory today as Madrid moves to take over the running of Catalonia, in response to the region's parliament unilaterally declaring independence. Lluis Gene/AFP/Getty Images hide caption
Supporters of Catalan independence wave Catalan flags as they drive with tractors through the Arc de Triomf in Barcelona on Tuesday. Jorge Guerrero/AFP/Getty Images hide caption
President of the Catalan regional government Carles Puigdemont (center) announced a referendum for independence from Spain on Friday in Barcelona. Lluis Gene/AFP/Getty Images hide caption