PHNOM PENH, Cambodia President Obama closed his Asian tour in diplomatic talks with leaders of Japan and China, their economic message overshadowed by security tensions over disputed waters and territories. The crisis between Israel and Hamas militants intervened, too, as Mr. Obama rushed his top diplomat straight from Cambodia to the Mideast.
Mr. Obama was wrapping up four days in Southeast Asia on Tuesday and starting the long journey home, where fiscal deadlines and decisions await.
On the margins of the East Asia Summit here, Mr. Obama met with two Asian leaders, outgoing Chinese Premier Wen Jiabao and Japanese Prime Minister Yoshihiko Noda, who is likely to be replaced. The president is devoting attention to the region to broaden U.S. influence in a part of the world long dominated by China.
But talk of trade was overshadowed by discussions over how to prevent violence over South China Sea territories. Southeast Asian leaders meeting here in the Cambodian capital decided to ask China to start formal talks "as soon as possible" on crafting a binding agreement on how to resolve such disputes.
Tensions have flared recently over rival claims by China, the Philippines and Vietnam to South China Sea islands and waters that are believed to be rich in gas and oil and that comprise some of the world's main shipping routes. Two other members of the Association of Southeast Asian Nations, Brunei and Malaysia, also have been embroiled in South China Sea rifts.
China has opposed any attempt to bring the disputes to international forums, and it has warned the U.S. to remain neutral in the disputes.
U.S. Deputy National Security Adviser Ben Rhodes said the United States favors a legally binding code of conduct and that such disputes should be resolved among the various countries involved, not one-on-one with China.
"The U.S. believes that any solution has to be consistent with international law, has to preserve the free flow of commerce that is important not just to the countries in this region but to the world," Rhodes said after the meetings. "The U.S. is not a claimant in the South China Sea, but we have significant interest there given its role in the global economy."
Separately, tension between Japan and China have risen over the uninhabited islands, known as Senkaku in Japan and Diaoyu in China. Tokyo nationalized some of the islands last month, reigniting a long-running territorial feud between China and Japan.
Noda alluded to the strains during remarks at the top of his meeting with Mr. Obama, telling reporters, "With the increasing severity of the security environment in East Asia, the importance of the Japan-U.S. alliance is increasing evermore."
Earlier this month, the U.S. and Japan held naval exercises involving some 37,400 Japanese and 10,000 U.S. troops, highlighting the tensions.
"There needs to be a lowering of tensions around these territorial disputes," Rhodes said following the meetings. "There's no reason to risk any potential escalation, particularly when you have two of the world's largest economies, China and Japan, associated with some of those disputes."
Mr. Obama and Noda, speaking to reporters ahead of their meeting, ignored shouted questions about the South China Sea disputes. So did Mr. Obama and Wen.
Meanwhile, the explosive crisis in the Middle East has competed for Mr. Obama's time throughout his trip.
On Tuesday, hein hopes that she can help mediate an end to bloody conflict in the region.
Clinton was to begin her Mideast diplomacy by meeting with Israeli Prime Minister Benjamin Netanyahu in Jerusalem. She also was to meet with Palestinian officials in Ramallah before heading to Cairo to meet with leaders in Egypt.
Israel has been firing rockets into the Gaza Strip in an attempt to end months of rocket fire out of the Hamas-ruled territory. The U.S. says Israel has a right to defend itself.