On Monday's broadcast of CNN's "The Lead," Special Presidential Envoy for Hostage Affairs Roger Carstens stated that it's tough to know what Russian assassin Vadim Krasikov will do now that he's been released as a result of the prisoner swap between the U.S. and Russia, but the definite release of wrongfully-detained Americans was worth the risk and "We can take different mitigation steps to, hopefully, make sure that he behaves himself as life goes forward."