Pentagon officials said Rumsfeld, who arrived Friday in Singapore for an annual defence leaders' conference, will urge inclusiveness. And they said he will take a more positive approach than last year when he took direct aim at China's ongoing military buildup and the need for greater openness in that country.

Rumsfeld's visit and his planned speech on Saturday "will underscore the strategic importance of Asia," Pentagon spokesman Eric Ruff said. "The secretary's visit here demonstrates our commitment to Asia and to the friends and allies we have in this region."

Speaking en route to Singapore, a senior defence official said Rumsfeld would not dwell on lingering questions about China's closely held military growth. The official, who spoke on condition of anonymity because the speech was not public yet, said instead Rumsfeld would speak more broadly about the need for the countries to work together.

The Bush administration was concerned last year when the Association of South East Asian Nations met with representatives from China, Korea and Japan, but excluded the United States.

Southeast Asia is an important ally for the US, with its strategic location and nations, such as Indonesia, that are largely Muslim and were allies in the war on terror.

Rumsfeld is scheduled to meet privately with a number of defence leaders from the region, including India's Defence Minister Pranab Mukherjee, who is making his first appearance at the conference, known as the Shangri-La Dialogue.

Representatives from about two dozen nations were invited to the meeting, which has been hosted by the International Institute for Strategic Studies for five years.

Rumsfeld has been an outspoken advocate of improving military relations with countries in Southeast Asia. He has complained that the United States "lost a generation of relationships" with the Indonesian military because of sanctions put in place because of human rights abuses by the military.

The gap in relations made it more difficult for the US to gather support after the September 11, 2001, attacks.

Embattled countries in the region are struggling to expand their economies and boost trade, while also fighting terrorism and trying to grow and improve their militaries.

Their progress, however, depends on how successfully they can balance delicate alliances with the United States and China.

"We're not going to say don't play with China, that's not the way we do business," said Elizabeth C. Economy, director of Asia Studies at the Washington-based Council on Foreign Relations. "But we want to make sure our relations are the primary ones."

She said the war in Iraq has soured relations between the US and some Southeast Asian countries. And only through more economic assistance and humanitarian support, such as the tsunami and earthquake aid, will the US be able to bolster its military and foreign policy relationships with those countries.