On the frontlines of the South China Sea

China is accused of ramping up its "bullying" tactics out on the South China Sea. During an exclusive embed with the Philippine government, CNN's Ivan Watson travels by ship and plane to witness the high-stakes confrontations at sea – as the unfolding clashes threaten to spiral into the next global conflict. Beijing has long defended its activities in the South China Sea, saying it is "legitimate and lawful" for China to "uphold its rights and security."