* Observer teams of 20 to be stationed both sides of the border
* Teams to contain both unarmed military and civilian observers
* Teams will report to ASEAN and U.N. Security Council (Adds analyst quotes)
By Olivia Rondonuwu
JAKARTA, Feb 22 (Reuters) - Thailand and Cambodia agreed on Tuesday to allow civilian and unarmed military observers from Indonesia to be posted along their border, where bloody clashes over territory surrounding a centuries-old temple erupted anew earlier this month, killing at least 11 people.
The agreement, brokered by a meeting of Association for Southeast Asian Nations (ASEAN) foreign ministers, is a breakthrough for the 10-member group long derided as a talking shop.
The move will likely go a long way towards stopping the fighting as, without independent verification, each side has blamed the other for starting the sporadic but frequently bloody clashes.
"This is just a fix but ASEAN will paint this as a success, and it is a success ," said Michael Montesano, a research fellow at Singapore's Institute of Southeast Asian Studies
" In achieving this, they have taken a step towards a very different ASEAN. The outside world will be particularly pleased that ASEAN has the ability to keep its house in order."
Although full details were not immediately available, Indonesian Foreign Minister Marty Natalegawa said each team would consist of up to 20 military and civilian members charged with observing a ceasefire agreed by both sides.
He said the teams would depart in a matter of weeks, if not days.
"It's quite a unique regiment in the sense that Indonesian observers will be on both sides of the boundaries, on the Thai side as well as on the Cambodian side," Natalegawa told reporters after meeting ASEAN counterparts.
He said the observers would report to both ASEAN and the United Nations Security Council.
APPEARED INEFFECTIVE
ASEAN, which prides itself on non-interference in members' internal affairs, has often appeared ineffective in resolving disputes among members.
The group includes Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Vietnam.
Fighting erupted between Thai and Cambodian forces early this month on a disputed stretch of border at the 900-year old Preah Vihear temple.
At least three Thais and eight Cambodians were killed and dozens of people wounded in the Feb. 4-7 exchanges. Sporadic clashes have broken out since then.
An international court awarded the temple to Cambodia 49 years ago but both countries lay claim to a 4.6 sq km (1.8 sq mile) patch of land near it.
They have been locked in a standoff since July 2008, when Preah Vihear was granted UNESCO World Heritage status, which Thailand opposed on grounds that the land around the temple had never been demarcated.
Cambodia initially asked the U.N. Security Council to deploy peacekeepers at the border and it has also asked for ASEAN observers. Thailand has called for a bilateral solution but said it welcomed ASEAN's "support".
The Preah Vihear temple, known as Khao Phra Viharn in Thailand, sits on a wedge of land on an escarpment that forms a natural border overlooking northern Cambodia.
The International Court of Justice in 1962 awarded the temple to Cambodia, which uses a century-old French map as the basis for its territorial claims, but the ruling failed to determine ownership of the scrub next to it. (Writing by David Fox; Editing by Sanjeev Miglani)
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