Who owns the Spratly islands in the South China Sea?
21 July 2011 Last updated at 06:09 BST
Five Philippine congressmen have travelled to a group of disputed islands in the South China Sea on what they are calling a peace mission.
They said it was a private trip to meet residents of the Spratly islands and support the Philippines' territorial claims. But China has said the visit could sabotage the relationship between the two countries.
Kate McGeown reports from Manila.