Apichart Weerawong, Associated Press
Cambodian dancers perform at the opening ceremony of the 20th ASEAN Summit in Phnom Penh, Cambodia Tuesday, April 3, 2012. Cambodia hosted the two-day summit of leaders of the Association of Southeast Asian Nations starting Tuesday.

PHNOM PENH, Cambodia — Southeast Asian leaders called for Western countries to immediately lift punitive sanctions imposed on Myanmar now that the once-pariah nation has embraced democratic reforms, and the U.S. took steps in that direction.

The leaders of the 10-member Association of Southeast Asian Nations made the call Wednesday after concluding an annual summit in the Cambodian capital, Phnom Penh. ASEAN member Myanmar was represented by President Thein Sein, who received a flurry of praise for his country's recent reforms, most recently Sunday's by-elections won by pro-democracy champion Aung San Suu Kyi and her party.

Cambodian Prime Minister Hun Sen said the appeal for sanctions to be lifted would first be relayed to the European Union, which punished formerly military-ruled Myanmar for massive human rights violations.

"We called for the lifting of all sanctions on Myanmar immediately in order to contribute positively to the democratic process and economic development in that country," the heads of state said in a statement, promising to help when Myanmar assumes ASEAN's rotating chairmanship in 2014.

Later Wednesday, the United States said it will soon nominate an ambassador to Myanmar — its first in nearly 25 years — and ease some travel and financial restrictions. In Washington, Secretary of State Hillary Rodham Clinton called Sunday's election a "dramatic demonstration of popular will that brings a new generation of reformers into government" that deserved recognition.

Many presidential and legislative sanctions remain against Myanmar, however. Many were imposed after Suu Kyi's National League for Democracy won elections in 1990 that were annulled by the junta.

Clinton said the U.S. would continue to press hard for further reform, including a verifiable cut-off in military ties between Myanmar and North Korea, the release of all political prisoners and an end to decades of fighting with ethnic minorities.

During the two-day ASEAN summit, Thein Sein reported to the other leaders that the elections saw a huge turnout of voters and were held peacefully, drawing praise from his counterparts, Indonesian Foreign Minister Marty Natalegawa said.

Myanmar's government, basking in newfound confidence, invited all of ASEAN's foreign ministers to visit the country's capital city of Naypyitaw as a group, possibly in the next few months, diplomats said.

Until recently, Myanmar was the black sheep of ASEAN, with other member countries repeatedly reprimanding it for its failure to move forward on a promised road map to democracy, including the freeing of Suu Kyi from years of house arrest.

"This is a tremendous change in the dynamics nowadays," Natalegawa said.

He said ASEAN foreign ministers would relay their appeal for the sanctions' lifting when they meet their EU counterparts in the near future.

Last month, the EU suspended entry restrictions against 87 top Myanmar officials to reward its moves toward political reforms, but a freeze on their assets will be maintained until further notice. The EU also still has in place an arms embargo and a ban on the sale of goods linked to internal repression. It also has suspended certain development aid programs.

The weekend vote in Myanmar will fill just 45 vacant seats in the country's 664-seat Parliament but took on historic significance because of Suu Kyi's presence. After two decades as a political prisoner, Suu Kyi won a victory that marked a turn in her political career and for the country as it emerges from a half-century of military rule.

While they mustered a united front on Myanmar, some Southeast Asian countries wrangled over a proposal to craft a nonaggression accord aimed at preventing armed clashes over territorial rifts in the South China Sea that involve China and ASEAN members Brunei, Malaysia, Vietnam and the Philippines. Taiwan also contests vast areas in the resource-rich region.

Other members of ASEAN are Cambodia, Indonesia, Laos, Myanmar, Singapore and Thailand.

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Philippine President Benigno Aquino III insisted ASEAN must craft such a "code of conduct" and then take it up with China as a group. Beijing opposes any arrangement that would force it to face a bloc of nations. China wants to negotiate with individual claimant countries over the disputes, something that will give it advantage for its sheer size.

The Philippines, backed by Vietnam, wanted Cambodia, ASEAN's steward this year, to make that sequence clear in a summit statement. Cambodia later issued a statement that avoided any mention of the contentious issue.

Cambodia's summit statement renewed ASEAN's call for the peaceful resolution to the issue of North Korea's nuclear program but completely ignored any mention of a rocket launch planned for later this month.