being reviewed. emirates airlines is changing its rules. canadian regulators changing that country wide. what do these rules mean? if a pilot or co- pilot steps out, another crew member will stand on the flight deck so no pilot is left alone. many wondering why the pilot was not able to bash his way into the cockpit. we will give you an up close look at the door to show you impenetrable it is. the u.s. not partiescipateing in the attacks in yemen. now the saudis and egyptians are threatening to send ground troops in yemen if necessary. we have cnn s ian lee in cairo.
arabia and their arab partners. on the other side you have the houthis rebels backed by iran. christine. ian lee in cairo, thank you. the u.s. is supporting the saudis in yemen. trying to secure a nuclear deal with iran at the same time. secretary of state john kerry heading the talks in switzerland insisting it will not effect the negotiations. the framework deal is four days away and this has president rouhani sending a letter to leaders involved in the negotiations. turning to iraq. a u.s. led coalition staged 17 air strikes in tikrit overnight. until now, iranian backed shi ite militias trying to oust isis from the birth place of saddam hussein. now the u.s. has entered the fight, they are boycotting the
egypt pledging war ships and troops. wolf blitzer talked to the saudi ambassador who detailing the objectives. we are prepare for all in the kingdom and outside the kingdom. we are prepared to defend yemen and degrade the abilities of the houthis. reporter: christine, ultimately this is a proxy war. yemen backing the rebels and then saudi arabia and arab partners backing yemen s president as well as the sunni tribes backing the president too. ian lee in cairo, thank you. in iraq u.s. led coalitions staged 17 air strikes against isis targets in tikrit overnight. until now, iranian backed shi ite militias leading the forces trying to oust isis from the birth place of saddam hussein.
ultimately, when you look at yemen. it is a proxy war. you have sunni tribes and the iranian backed houthis fighters. with that you are seeing really these two large countries, saudi arabia and iran square off. ian, if there were a ground invasion how effective could a ground invasion actually be in yemen? reporter: i have been to yemen and in the mountains surrounding it. they are perilous. it is similar in part to afghanistan. houthis have been in the area for centuries. they know the terrain very well. it will be difficult for any sort of ground force. when you look at arab armies these are not well trained with
gurella tactics. right now, they are hoping these air strikes can be sufficient enough but any land scale operation will incur heavy casualties. that is something different arab capitals have to be ready to explain why forces are there. ian lee in cairo, thank you. turning to iraq a u.s.-led coalition staged 17 targets in tikrit overnight. until now, iranian backed shi ite militias were leading the forces. they are threatening to attack americans. let s bring in jomana karadsheh live from baghdad. complicated, jomana. reporter: it is a very complicated situation,