A London paper reports Russia-based Twitter accounts posted over 45,000 messages within 48 hours during last year's Brexit referendum.
A total of 20 former Catalan leaders face charges relating to the independence referendum Madrid deemed illegal.
The five former officials had fled to Belgium and face rebellion charges in Spain.
A Spanish judge has issued an international arrest warrant for Carles Puigdemont, who orchestrated Catalonia's independence referendum.
Spain's government has approval to impose direct rule under Article 155, but it's not immediately clear how that will be implemented.
The region's parliament voted overwhelming in favor of a resolution to make Catalonia "an independent, sovereign, democratic, social State."
Catalonia's president put off declaring independence a second time.
Spain's prime minister has asked for Senate approval to remove Catalan officials from office.
Spain plans to invoke Article 155, which allows the central government to institute direct rule over the country's semi-autonomous regions.
The Spanish government announced Thursday it's going to start the process of invoking Article 155 of its constitution.
In a speech to the Catalan Parliament, Carles Puigdemont said he will follow the will of those who voted in the Oct. 1 referendum.
France's minister of European affairs said Monday if Catalonia declares independence, France won't recognize it as a state.