The Briefing 03-21-16

Obama's historical visit to Cuba highlights difficulties of statecraft in a fallen worldLos Angeles Times (Christi Parsons and Kate Linthicum) — 'This is a historic visit and a historic opportunity,' President Obama says in CubaLos Angeles Times (Tracy Wilkinson) — Cuba ordering its dissidents to skip meeting with ObamaFinancial Times (Geoff Dyer) — Historic steps as Obama starts Cuba trip

Evil in the heart of man: ISIS operative's arrest reveals bloodthirsty change in tacticsNew York Times (Rukmini Callimachi, Alissa J. Rubin and Laure Fourquet) — A View of ISIS’s Evolution in New Details of Paris Attacks

North Korea sentences American student to 15 years hard labor for theft of "sacrosanct" signNew York Times (Choe Sang-Hun) — U.S. Student Runs Afoul of North Korea’s Devotion to Slogans

Twitter celebrates its 10th anniversary. How has its 140-character limit shaped the world? Fortune (Kia Kokalitcheva) — Looking Back at Twitter As It Celebrates Its 10th Birthday on March 21