"Though we've been busy at home, the crisis still confronts us in other parts of the world from the Middle East to Ukraine. But I want to be very clear. Let me be clear about this, because some people have wondered whether because of what happens in Ukraine or what happens in the Middle East, whether this will sideline our strategy -- it has not.
Obama's visit to the region is a personal manifestation of the foreign policy "pivot" to Asia his administration enunciated two years ago but has struggled to translate in concrete terms.
Obama, whose three-day visit to the South East Asian country comes in nearly five decades by a US President, noted that America has responsibilities all around the world, and said: "We're glad to embrace those responsibilities."
"And, yes, sometimes we have a political system of our own and it can be easy to lose sight of the long view. But we have been moving forward on our rebalance to this part of the world by opening ties of commerce and negotiating our most ambitious trade agreement; by increasing our defense and educational exchange cooperation, and modernising our alliances... Building deeper partnerships with emerging powers like Indonesia and Vietnam.
"And when you put those countries together, you're the seventh largest economy in the world, the fourth largest market for American exports, the number-one destination for American investment in Asia," Obama said.
Obama said he believed that together "we can make the Asia Pacific more secure.