ground by this machine gunner. his responsibility, as far as he can see. but this is a long border. 800 kilometers, 600 miles. summer and its scorching heat is coming. and as yet, no sign the enemy is ready to quit. cnn from the saudi/yemen border. and while russia might veto that u.n. resolution against the iranian backed houthis, it might also give some direct military help to iran. it is a move that the u.s. is concerned about. here s our jim sciutto with more. those powerful russian surface-to-air missiles may soon be in the hands of iran. moscow lifting its ban on selling the missiles to tehran. u.s. officials responded quickly with alarm. secretary of state john kerry