Martha Raddatz interviews Americans who have joined the fight against Russia on the ground in Ukraine on “This Week.”

SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP
Watch More on http://abcnews.go.com/
LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews
FOLLOW ABC News on TWITTER: https://twitter.com/abc

#ABCNew #ThisWeek #Ukraine #ForeignFighters