disputed part of the sea. china s foreign ministry said it monitored the ship s movement and now called for the u.s. to, coa quote, immediately change its mistake. and not take any provacative act. this isn t a huge surprise. expected in many ways. what details is the u.s. providing about this mission and if it s something that will become routine. reporter: well, if you listen to u.s. defense officials, this is or this was a routine mission according to the u.s. they conducted a transit within 12 nautical miles. that s one of the reeves that the chinese have turned into a manmade island and claimed to be a coverage territory. we understand there were u.s. aircraft in the air to provide cover and surveillance. u.s. officials are saying this is a routine mission, what they