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North korea appears to have gone through a significant makeover here. the hermit state says it's taking technical measures to their nuclear sites and inviting journalists to watch. >> reporter: president trump tweeted this. cnn senior international correspondent ivan watson is live with us from seoul, south korea. ivan, is this scene worldwide as that kind of a gesture, gracious and smart? >> reporter: it certainly is another olive branch that north korea is offering. . pledged last month it would dismantle this nuclear testing facility. it's a mountain in the north of north korea where we bel...

To do that, you'd have to be able to go all the sites and stipulate that you want to go to sites that the iranians haven't declared so you can check out whether there's suspicious activities occurring elsewhere. getting into one site alone doesn't give you any degree of confidence that you get the full picture of nuclear activities in the country. >> and the test of whether iran is going to widen its agreement and allow those inspectors to go in and see all the sites will come during these talks which begin in baghdad tomorrow between iranian negotiators and six nations including the united st...

Despite efforts to reduce nuclear arsenals, what if the president one day has to order a nuclear attack? almost two decades after the united states stopped testing these weapons by exploding them, how can it make sure the warheads actually work? our foreign affairs correspondent, jill dougherty, takes us on an exclusive tour of the u.s. nuclear testing facility in livermore, california. >> this is the only place in the world where you can get to the nuclear phase of a weapon without blowing up a bomb. >> reporter: the u.s. stopped testing nuclear weapons by blowing them up above ground or belo...

Latest updates on this topic from reliable sources.

Wefr be we've been down this road before. i haven't seen a lot of evidence yes. >> why is it hard for you to say yes to that? >> so far he hasn't -- the north koreans haven't done anything different from the past. they closed up the nuclear testing facility, the island. they closed up the entrances to mountain. they blew up or destroyed the missile testing facility. those things we have seen in the past. all this is not unusual. i haven't seen any reason to think they are going to cheat yet. we have to try. this is a new leader. none of the previous negotiations to kim jong-un. he has undertak...