-korea institute at johns hopkins university, and founder of 38-north, a website that focuses on korea. joel wit, how concerned should we be about this latest launch? >> well, of course, we should be concerned because north korea is obviously moving to the development of a missile that can reach the united states, but this is not new. this is the third test they've conducted, and we've known for some time that they are moving down this road. so it just reconfirms what's going on and it's, of course, very dangerous. >> brangham: the north koreans argue they are now a fully-formed nuclear power. is that true and, if so, what does that do to our diplomacy? >> well, the reality is north korea has had nuclear weapons for some time now, and they've also been able to put them on missiles that can reach other countries in the region, like our ally south korea and japan. so now they are expanding their reach by developing missiles that can reach the united states. so they have been a nuclear weapons state for some time now, they have been a threat to other countries in the region, and now they'
he is dean of the johns hopkins school of advanced international studies. he served as a senior adviser in the state department under president obama. and, faysal itani is a senior fellow in the rafik hariri center for the middle east at the atlantic council, a washington think tank. and welcome to both of you to the "newshour". vali nasr, to you first, is president putin right that military conflict in syria is just about at an end? >> no, probably this a war will continue in fits and starts for some time, but he would like to tell the world that the major reasons as to why the war was going on, in other words the fight against i.s.i.s., is over, and the other important message is that if the war was really about removing assad from power, he wants to say that effort is over as well. so it's a major signal he wants to send that as far as russia is concerned, we're moving to the next stage. >> woodruff: as far as russia is concerned. to faysal itani, and russia is the most influential factor in the war at this point, is that correct? >> they are the reason
hopkins university; and, timothy wu, he's a professor at columbia law school in new york city. he served as an adviser on the white house national economic council, in 2016. gentlemen, thank you both for being with us. thomas wu, to you first. do we understand why it was so easy for the russians and others to infect the social media platforms with what they wanted to say in. >> you mean me, thomas rid first? >> woodruff: i'm sorry, i misspoke, timothy wu, yeah. >> i think we do. i think what we learned from today's hearings is that the companies themselves are acknowledging they do have a problem. they're open. they're big, automated machines. so as i think senator kennedy put it, you know, they have five million advertisers. anyone can advertise very precisely to what they want, and that can also create fake accounts to spread whatever news they want. these are extremely vulnerable systems for foreign propaganda. >> woodruff: and thomas rid, these companies are now august acknowledging that their guard was down, that they did not do enough to screen what was coming in? >> they
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