Russia-installed law enforcement officers in Ukraine's Moscow-annexed Crimea have detained Crimean Tatar activist Mustafa Mustafayev and his son after searching their home on March 23, the Crimean Solidarity human right groups said. It is not clear why and on what charges the search and the detentions were based. Since illegally annexing Crimea in 2014, Russia has imposed pressure on Crimean Tatars, the peninsula's indigenous ethnic group, many of whom openly protested the annexation. Dozens of Crimean Tatars have been sentenced to lengthy prison terms by Russian authorities on extremism charges since then. To read the original story by RFE/RL's Crimea.Realities, click here.