Reuters – Myanmar brought ashore more than 700 "boat people" it had kept at sea for days aboard a seized vessel, as the United States on Wednesday called on the country to help solve a migrant crisis by recognising the rights of its Muslim Rohingya minority.

U.S. President Barack Obama has sought to make Myanmar's transition to democracy a legacy of his presidency, and Washington is stepping up pressure on the Southeast Asian nation to tackle what it sees as the root causes of an exodus of migrants across the Bay of Bengal that the region has struggled to cope with.

The 727 migrants were found drifting in the Andaman Sea on Friday in an overloaded fishing boat that was taking on water. Myanmar's navy brought the vessel to the coast of western Rakhine state, where they disembarked on Wednesday.

Scores of migrant men were sat on the ground at the landing spot near the town of Maungdaw, close to the border with Bangladesh, a Reuters witness said.

Others assembled inside a warehouse, and all were being watched over by dozens of police, the witness said. There were no aid personnel yet at the site, he added.

Many of the more than 4,000 migrants who have landed in Indonesia, Malaysia, Thailand and Myanmar since the Thai government launched a crackdown on people-smuggling gangs are Rohingya who say they are escaping persecution.

It was not immediately clear where the people on the boat were from. Myanmar authorities have said they believe most are Bangladeshis.

Myanmar officials had said last month that another migrant boat found at sea with more than 200 people on board was mostly filled with economic migrants from Bangladesh. But interviews by Reuters found more than 150 Rohingya had earlier been on the same boat, but were quietly whisked off by traffickers before authorities brought the vessel to shore.

NOT CITIZENS

Myanmar does not recognise its 1.1 million-strong Rohingya minority as citizens, rendering them effectively stateless. Many have fled the apartheid-like conditions of the country's Rakhine state. Myanmar denies it discriminates against them.

"Rohingyas need to be treated as citizens of Burma," U.S. Assistant Secretary of State Anne Richard told reporters at a press briefing in Jakarta, using the country's former name.

"They need to have identity cards and passports that make clear they are as much citizens of Burma as anyone else."

Obama said on Monday that Myanmar needed to end discrimination against the Rohingya people if it wanted to succeed in its transition to a democracy.

Politicians in Myanmar were focused on a historic general election scheduled for November, Richard said, which was hindering political discussion of the status of the Rohingya, who are deeply resented by many of Rakhine's Buddhist majority.

Images of desperate people crammed aboard overloaded boats with little food or water has focused international attention on the region's latest migrant crisis.

The crisis blew up last month after the Thai crackdown made it too risky for people smugglers to land their human cargo. Smugglers abandoned boats full of migrants at sea.

SUU KYI SILENCE

Richard said she would like to see all Myanmar's political leaders address the issue. Opposition leader and Nobel Laureate Aung San Suu Kyi has faced international criticism for failing to speak out on behalf of the nation's many ethnic groups, including the Rohingya.

"We would love to see all Burmese leaders speak up on human rights and to realise that they should help the Rohingya," Richard said. "The boats are not going to wait until December - the people on the boats need help right now."

At an international meeting on the migrant crisis in Bangkok on Friday, Myanmar bristled when the United Nations raised the citizenship issue and when other delegates blamed the country for the problem.

"You cannot single out my country," said Myanmar's head of delegation Htein Lin.

Richard said that the United States was not considering imposing sanctions on Myanmar over the issue, but that sanctions were always "in the diplomatic toolbox".

Obama has invested significant personal effort and prestige in promoting democracy in Myanmar, which emerged from 49 years of military rule in 2010, travelling there twice in the past three years.

The U.S. president said in a routine note to Congress last month that Washington - while not curtailing engagement with Myanmar - would maintain some sanctions on the country.

"We really hope we are working with a Burma that is on a path to being a more responsible member of the international community," Richard said.

Many Bangladeshis fleeing poverty at home have joined the Rohingya on the boats.

Around 800 Bangladeshis were among more than 1,800 migrants who landed in Indonesia's Aceh in May, Thomas Vargas, the representative to Indonesia for U.N. refugee agency UNHCR, told reporters at the same press briefing on Wednesday.

Among the group of 1,800 were some 350 unaccompanied minors, he said.

Vargas reiterated a UN estimate that around 2,000 people were still at sea and said the first priority for nations involved in the crisis and for international organisations should be to save lives.