Read MoreWall Street Journal reporter Evan Gershkovich and Marine veteran Paul Whelan were among two dozen prisoners freed as part of the biggest prisoner swap between the U.S. and Russia since the end of the Cold War. The complex exchange took place in Turkey and involved more than six nations. Nancy Cordes has the latest.Wall Street Journal reporter Evan Gershkovich and Marine veteran Paul Whelan were among two dozen prisoners freed as part of the biggest prisoner swap between the U.S. and Russia since the end of the Cold War. The complex exchange took place in Turkey and involved more than six nations. Nancy Cordes has the latest.