WASHINGTON - President Obama will leave Tuesday for a four-nation trip to Asia, looking to recharge a focus on the region, an ambitious initiative that has been sidetracked by domestic politics and international conflicts elsewhere.
Yet even as Obama attempts to boost his effort to emphasize U.S. interest in Asia, Russian President Vladimir Putin's intervention in Ukraine is complicating efforts to reassure Asian nations - which share the region with an increasingly assertive China - that the U.S. is committed to their security.
The administration's efforts to refocus U.S. policy toward Asia were already being questioned in the region with the departure of Secretary of State Hillary Rodham Clinton, who made Asia her first official overseas destination in 2009, and worries that a tight U.S. budget and continuing turmoil in the Middle East were proving too distracting for the administration.
Obama added to those worries last fall when he scrapped plans to attend two summits in Asia because of the federal government budget shutdown. Two of the stops on this week's trip - Malaysia, where he will be the first U.S. president to visit since Lyndon Johnson, and the Philippines - had been on his itinerary last fall. He will start the trip with visits to U.S. allies Japan and South Korea.
Asia watchers said there was fear that the U.S. did not have the staying power and would not have the money to back up its claims of commitments to boost economic, security, and diplomatic ties with Asia.
"In polite company people won't say it, but behind closed doors I think they'll openly ask where the pivot is. They don't know where it is," said Victor Cha, a senior adviser and Korea chair at the Center for Strategic and International Studies, a Washington research center.
Russia's apparent success at slicing off Ukraine's Crimea region without paying a significant price is raising fears about whether the U.S. would be reluctant to act if nations in the region faced similar aggression from neighboring countries.
The trip comes as tensions in the region have mounted, with China rattling its neighbors in November by aggressively expanding its airspace to include contested waters between China and Japan.
Regional sources of fear include North Korea's bellicosity and the possibility that it "could seize a couple of islands in the West Sea and see if [it] can pull off [its] own fait accompli," Cha said. "Having the president in the region, sending strong messages . . . and talking with all the allies, I think helps to shape the strategic environment in which nobody comes up with crazy ideas like this" in Asia.
The Ukraine crisis also comes on the heels of Obama's decision last fall to consult with Congress on a possible military strike on Syria, whose regime has been blamed for a chemical weapons attack. That decision perplexed Asian nations, analysts said.
"They've always counted on strong executives bringing the Congress along or going around Congress to make sure security guarantees are honored," said Douglas Paal, vice president for studies and director of the Asia program at the Carnegie Endowment for International Peace.
But Ukraine is not a formal U.S. ally, and the U.S. has long-standing security commitments and alliances with the Asian countries, said Jeffrey Bader, a former Obama administration senior director for East Asian affairs and a senior fellow in international diplomacy at the Brookings Institution. He called it "fundamentally false" that allies in the region are nervous about the U.S. reaction to Ukraine and see parallels to their region.
"The U.S. has a mutual security treaty with Japan for over 50 years which is NATO-like in its firmness," Bader said.
National security adviser Susan Rice said the administration had not heard any unease from Asian allies, who she said "look to the United States as a partner of first choice" for help settling territorial disputes and responding to humanitarian and natural disasters.
"There should be no question that where we have alliance commitments and treaty obligations, in the Asia Pacific region or anywhere else in the world, we will uphold those obligations willingly and definitively," Rice said.
She called the trip "an opportunity to affirm our commitment to the region and its security, and to show that the United States is and will remain for the long term a major security partner and a force for rule of law, stability and democratic development."
Obama is not visiting China on the trip, but the country will loom large. The president's challenge will be to reassure his hosts that the U.S. will be a major partner for the allies without feeding into a narrative that it is trying to contain China.