u.s. would never give up on whelan. moscow is treating whelan different than griner, totally illegitimate reasons. whelan said he was surprised that he had been left behind. jim sciutto reports. >> reporter: paul whelan's odyssey in russia's criminal justice system began on december 28th, 2018. former marine, he was arrested in moscow during a trip for the wedding of a fellow marine to a russian woman. >> ended up taking a group of them as part of their tour through the kremlin. >> russia's federal security service accused him of being a spy. whelan had visited russia before, including as early as 2006 while on a two-week deployment from iraq. whelan moved to the u.s. as a child. he has u.s., canadian, british, irish citizenship. whelan joined the marine