Obama set to challenge China at Asia-Pacific summit

US President Barack Obama is set to challenge China when Asia-Pacific leaders gather in the Philippines this week, speaking out on a territorial row and lobbying to set pro-American trade rules. Chinese President Xi Jinping will also be in Manila for the Asia-Pacific Economic Cooperation (APEC) summit, an annual event that is meant to forge unity on free trade within the region. Philippine authorities had already undertaken their biggest security operation for the summit, which will gather leade