MADRID—Spanish Foreign Minister Jose Manuel Albares called on Cuba on Tuesday to immediately release Camila Acosta, a journalist detained in Havana on Monday after covering civil unrest in the country for Spanish newspaper ABC. “Spain defends the right to demonstrate freely and peacefully and asks the Cuban authorities to respect it. … We demand the immediate release of Camila Acosta,” tweeted Albares on his second day on the job. Cuba’s government cracked down on activists on Monday night after mass protests drew thousands to the streets over the weekend in the biggest anti-government demonstrations seen on the Communist-ruled island in decades. Acosta, who describes herself on Twitter as an independent Cuban journalist, had been writing for ABC and uploading photos of the unrest to social media. At least 100 protesters, activists, and independent journalists have been detained nationwide since Sunday, according to exiled rights group Cubalex. Right-leaning Spanish daily ABC …