respect to cluster munitions. aisle have to take your question on the geneva convention. i'm not an expert on that. rather than spit ball it, i'll take the question and we'll get back to you. abr abraham. >> is the u.s. continuing to fly over the black sea and if not, why not? >> i'm not going to talk about flight profiles. we don't have any aircraft man or unmanned flying in ukrainian air space. the question about specific coordination or communication with the youukrainiukrainian, i put to nato.