An Indonesian minister said on Thursday that government has sent a protest note against the plan of U.S. military to build a military base in Australia's Cocos island located 3,000 kilometers south of its territory, saying that it would disrupt the country's sovereignty.

"Our protest was based on the data we already gathered regarding the issue. The data were gathered through monitoring using planes and radar. We had conveyed the protest note," Coordinating Minister for Political, Legal and Security affairs Djoko Suyanto told a press conference here.

He said that the protest note had been conveyed to Australia and U.S. governments. According to the minister, there had been interactive communication between related institutions in Australia and U.S. regarding the protest. "Each country had the rights to protect their sovereignty," the minister said.

Australian Defense Minister Stephen Smith said in earlier reports that the United States intended to use Cocos island as the base for its surveillance planes. But the plan, he said, would not be implemented in the near future.

If the United States goes ahead with the plan, Cocos island would replace its military base in Diego Garcia island that located in Indian ocean. The U.S. military base in Diego Garcia is hired from the British.

The Cocos island is located in west side of Indian island, south of Indonesia's island of Sumatra.

U.S. media reported that the island is an ideal base to accommodate reconnaissance aircraft including Global Hawk drone, the most sophisticated surveillance aircraft operated by US air force.

Australian Premier Julia Gillard said that talks with the U.S. administration regarding the plan is underway at the moment.