Russian-American ballerina Ksenia Karelina was released from Kremlin custody in a prisoner swap with the United States on Thursday morning. Karelina was freed in exchange for German-Russian Arthur Petrov at a swap in Abu Dhabi, the Wall Street Journal reported. “American Ksenia Karelina is on a plane back home to the United States,” Secretary of State Marco Rubio said. “She was wrongfully detained by Russia for over a year and President Trump secured her release. @POTUS will continue to work for the release of ALL Americans,” he added. The dual-citizen spa worker was accused of treason against the Russian government...