Prime Minister Pedro Sanchez says peace talks will begin this month after meeting with separatist president of Catalonia, Quim Torra, in Barcelona.
The National Electoral Board took the decision to strip regional Catalan President Quim Torra of his seat after a Catalan court barred him last month from public office during 18 months for disobedience.
Hundreds of people packed a square in front of Catalonia's regional government headquarters in Barcelona for a rally by the centre-right, pro-union Ciudadanos party.
Young people draped in Catalan flags congregated peacefully, tossing balls and skipping rope. Later the mood turned ugly, with protesters setting fire to cafe chairs on the fashionable Rambla de Catalunya street at the heart of the tourist district.
Quim Torra, a close ally of former leader Carles Puigdemont, fell short of being elected the new Catalan leader by two votes.
Catalonia's parliament will start debating on whether to appoint staunch independence supporter Quim Torra as regional president, after deposed leader Carles Puigdemont stepped aside from the running.
Protesters blocked a main motorway through eastern Spain near the French border, another highway leading to the city of Lleida, a national road between Tarragona and Valencia and several roads in central Barcelona.
German authorities have 60 days to decide whether to extradite region's former president Carles Puigdemont to Spain and comes five months after he went on run after vote on independence.
The protests came after the Spanish Supreme Court detained five Catalan separatist leaders, including Catalan presidential candidate Jordi Turull. In total 25 people, the core of the movement, have been indicted over last year's independence drive.
Catalonia's former leader Carles Puigdemont provisionally withdrew his bid for a second term as president, saying his party would propose a pro-secession campaigner, Jordi Sanchez.
The speaker of the Catalan parliament postponed the vote, but said that self-exiled former president Carles Puigdemont was the only viable candidate to lead the restive Spanish region.
Catalan leader Carles Puigdemont has been living in self-imposed exile in Belgium, having fled arrest after organising an independence referendum from Spain in October.
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