outage in the days after the president's comments. press secretary josh earnest said the sanctions are the first aspect of our response. and the u.s. is not ruling out the possibility that north korea may have done it to themselves. and just how much the new sanctions will pinch north korea's isolated economy is unclear. senior administration officials say the u.s. is not certain whether the ten people targeted in the sanctions even have assets in the u.s. but the white house made it clear today, that more is on the way. they are just getting warmed up on this front. >> it could be costly to the north korean economy. thank you, jim acosta joining us from hawaii. joining me author of nuclear showdown and david cong director of korean studies at the university of southern california. david, i want to begin with you, because you said you believe the latest sanctions are more