Assessing Russian troop casualties in Ukraine

Ukraine said 11,000 Russian troops have died in Ukraine since the Russian invasion began. Former White House Security Advisor Tom Bossert said it's "impossible" to know the actual number.

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

#ABCNL #Ukraine #Russia