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U.S. President Barack Obama boards Air Force One as he departs the Ninoy Aquino International Airport in Manila, the Philippines Tuesday, April 29, 2014. The Philippines is the last leg of Obama's four-nation Asia tour. (AP Photo/Aaron Favila)

Obama's four-nation visit to Asia

President Barack Obama ended a four-country swing through Asia and headed for home Tuesday, still confronting the challenge of how to deal with Russia's threatening moves toward Ukraine. The issue overshadowed an Obama tour that was meant to reassure anxious allies in the orbit of a rising China that the U.S. will always be there to defend them. (AP)

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