d it's for that reas i think we, that's why we care about the south china sea or east china sea and the challenge that we face just goes to house point of the changing regional balance, that some of the rising regional powers or in some cases declining regional powers that are exerting themselves more completely dominating their own region, they found they can take certain actions that fall below the threshold that normally elicit a military response from us. they can, through a series of salami slices begin to take away the foundations of this order. so we are faced with a very challenging question. >> as china militarize his the land reclamation project, the am far they are building starts to put airstrips, but what point you respond? when you put hq nine antiaircraft missiles, do you take them out then? maybe not, it doesn't seem like a small objective, a massive us military response that would put us in conflict but maybe wait until late, is that enough? what about three, what about 10, what about 100? what about when you wake up one day and find that you created an air defense info