The countries in Southeast Asia on the US's radar

This article on Obama's courting (for lack of a better word) countries in China's periphery is a short but good read, and lists the countries themselves:

Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar (Burma), the Philippines, Singapore, Thailand, Vietnam.

Adding to that a few of the US's existing allies in the region (map made thanks to this site) and you can see how uncomfortably close this all is from China's point of view:

But then again everything there is uncomfortably close. Especially that strait where all the shipping passes through between Singapore, Malaysia, and Indonesia. And the whole South China Sea itself.