China hasunveiled details of its plan for building and maintenance projects on some of its islands in the South China Sea, saying it aims mainly to provide a civilian service that will benefit other countries.

READ:China defends land reclamation on disputed islands

The details were announced by its foreign ministry, which also accused Washington of adopting double standards on the issue by ignoring building work by other countries on islands owned by China.

Foreign ministry spokeswoman Hua Chunying said at a regular news briefing, We are setting up shelters, aids for navigation, search and rescue as well as marine meteorological forecasting services, fishery services and other administrative services.

These will provide necessary services to China, neighboring countries and individual vessels sailing in the South China Sea.

Hua said the construction work also aims to meet necessary demands for Chinas military defense, but the efforts are aimed more at providing civilian services in an area that suffers frequently from typhoons and where many vessels sail far from land.

The construction work is a matter that is entirely within the scope of Chinas sovereignty. It is fair, reasonable and lawful. It does not affect, and is not targeted against, any country. It is beyond reproach, Hua said.

Reuters said in a report on Thursday, It is rare for China to give such detail about its plans on such construction work.

Luo Yongkun, a researcher specializing in Philippine studies at the China Institute of Contemporary International Relations, said Beijing has made a friendly gesture by disclosing details of construction work on its territory to assure its neighbors and remove any misunderstandings.

United States defense secretary Ashton Carter, who is visiting Asia this week, has said he is especially concerned about construction work by China on the islands.

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China unveils plan on South China Sea islands