u.s. occurred offshore but the one in canada occurred overland. so is it effective u.s. policy to not shoot down the objects overland for safety concerns? >> i would not read into this a policy decision. we will always, in deciding whether something should be taken down or not, consider the impact on the ground. >> when the chinese, the chinese foreign ministry indicated they would respond in a way they were prepared to, if it turns out the other objects are chinese in origin, is there a menu by the president how to react? >> hypothetical -- >> and china buying more oil from russia, china opening up cases in the u.s. trying to steal u.s. technology from universities, president xi is going to be meeting with the iranian president. at what point do you do a big review of the u.s. relationship with china and what point does