What We're Following This Evening

American security in Turkey: The Obama administration has ordered all family members of U.S. troops and diplomats living in Turkey to leave and return to the U.S., citing security concerns over the threat of the Islamic State. The decision comes after about a dozen Americans were injured in the Brussels attacks last week, including an Air Force officer who was stationed in Europe and his family.

Putin’s other mission accomplished: The Russian president said this month that his forces had done what they’d set out to in Syria, which was help the Assad government go after terrorists. Now it appears Russia’s five-month-long campaign in Syria also yielded some economic benefits: Putin says Russia made more money off exports of military products in 2015 than expected.

On the campaign trail: Donald Trump, Ted Cruz, and John Kasich will participate in a town hall hosted by CNN tonight. It’s been a big news day for the Trump campaign. The Republican front-runner’s campaign manager was arrested for allegedly grabbing a reporter’s arm during an event in Florida earlier this month. Trump says he stands by his staffer. David has the story here.

News from this afternoon here