say that china was concerned about north korea's missile development activities and its nuclear development program, as well. both of which, of course, are banned by numerous united nations security council resolutions. wolf? >> one thing that potentially is significant, i believe, and ivan, you're there in the region, air china in recent days has suspended all of its flights from china to pyongyang, the north korean capital the official airline is the only airline bringing people in and out of north korea. that's a statement china is making suspending flights between china and north korea. >> that's right. a sign some of the levers that china could clearly tighten on north korea and something that u.s. administration, the current one and previous ones have called for and perhaps that's part of why our own will ripley