Putin may want to swap an 'illegal' Russian spy for Evan Gershkovich

ViewEvan Gershkovich is being held in Russia's notorious Lefortovo Prison on espionage charges. Who would Moscow be willing to swap for the Wall Street Journal reporter? 

"They've arrested him on the absurd charges of being a U.S. spy. And they are therefore trying to angle, it seems to me, to get one of their own Russian...