US is set to bolster its military presence in the Persian gulf by posting combat forces in Kuwait to respond to a collapse of security in Iraq or a military confrontation with Iran.

The build up of troops in Kuwait will come after the remaining American troops withdraw from Iraq later this year, the New York Times reported quoting officials and diplomats.

The repositioning of the US forces in the region, besides deploying combat troops in Kuwait also envisages sending more naval warships to international waters off the region.

Negotiations for placing ground combat troops in Kuwait are far advanced and as the new US military response would also entail expanded military ties with six nations of the Gulf Cooperation Council (GCC)--Saudi Arabia, Qatar, Kuwait, Bahrain, Oman and UAE.

Though Washington has already close military ties with all the gulf nations, officials said US was planning a 'security architecture' for the gulf that would integrate air and naval patrols and missile defence, the report said.

President Barack Obama has already announced that all US troops would leave from Iraq by the end of the year, ending the eight-year war, but American officials fear that withdrawal could lead to instability or worse in its wake.

The US is pressing the Iraqi government to permit as many as 20,000 American troops to remain in Iraq beyond 2011, but the Pentagon is also drawing up an alternative security map.

The size of the standby American combat force to be based in Kuwait remains the subject of negotiations, with an answer expected in coming days.

Officers at the Central Command headquarters here declined to discuss specifics of the proposals, but it was clear that successful deployment plans from past decades could be incorporated into plans for a post-Iraq footprint in the region.

For example, in the time between the Persian Gulf war in 1991 and the invasion of Iraq in 2003, the US Army kept at least a combat battalion -- and sometimes a full combat brigade -- in Kuwait year-round, along with an enormous arsenal ready to be unpacked should even more troops have been called to the region.

"Back to the future" is how Major General Karl R Horst, Central Command's chief of staff, described planning for a new posture in the Gulf. He said the command was focusing on smaller but highly capable deployments and training partnerships with regional militaries.

"We are kind of thinking of going back to the way it was before we had a big 'boots on the ground' presence," Horst said. "I think it is healthy. I think it is efficient. I think it is practical."

Obama and his senior national security advisers have sought to reassure allies and answer critics, including many Republicans, that the US will not abandon its commitments in the Persian Gulf even as it winds down the war in Iraq and looks ahead to doing the same in Afghanistan by the end of 2014.

"We will have a robust continuing presence throughout the region, which is proof of our ongoing commitment to Iraq and to the future of that region, which holds such promise and should be freed from outside interference to continue on a pathway to democracy," Secretary of State Hillary Rodham Clinton said in Tajikistan after the president's announcement.

During town-hall-style meetings with military personnel in Asia last week, the secretary of defence, Leon E Panetta, noted that the US had 40,000 troops in the region, including 23,000 in Kuwait, though the bulk of those serve as logistical support for the forces in Iraq.

The New York Times quoting officials of the US Central command said that the post-Iraq era required them to seek more efficient ways to deploy forces and maximise cooperation with regional partners.

One significant outcome of the coming cuts, officials said, could be a steep decrease in the number of intelligence analysts assigned to the region. At the same time, officers hope to expand security relationships in the region.

The US moves to reposition forces in the Gulf still requires the approval of the GCC, whose leaders will meet again in December in the Saudi capital, Riyadh, and the kind of multilateral collaboration that the administration envisions must overcome rivalries among the six nations.

"It's not going to be a NATO tomorrow," said a senior administration official, who spoke on diplomatic negotiations still under way, "but the idea is to move to a more integrated effort."

Iran, as it has been for more than three decades, remains the most worrisome threat to many of those nations, as well as to Iraq itself.