Transcript for China Flexes Muscles, Sends Warplanes into Disputed Airspace
inviting united nations inspectors to visit an unfinish reactor. China raising the stakes in its latest campaign to demonstrate its military might. China's move has drawn the u.S. To respond tonight. Gloria arrive aria reporting from beijing. David, the tension here is only growing, china has flexed its muscle to the world and is refusing to back down. Reporter: The message was delivered by america's new ambassador caroline kennedy, a warning to china, after it insisted it has the right to police the sky over a series of islands. What might seem small, experts say is a big, bold move by china. An act of defiance, and control, from the superpower. But the u.S. Was quick to respond, flying two b-52 bombers unannounced into the zone, and now japan and south korea have tested china too with their own flights. Today china responded by sending fighters jets into the zone. Raising the stakes, vice-president joe biden will be in china in the coming days. We are told he will ask china to explain what's behind the aggression. David?
This transcript has been automatically generated and may not be 100% accurate.