In a move that would infuriate China, Australia on Saturday backed the United States in declaring Beijing territorial claims in the South China Sea to be illegal. In a letter to the United Nations, Australia's permanent mission rejected the Chinese Communist Party's claim to disputed islands in the crucial trading waters, calling them "inconsistent" with international law. "The Australian government rejects any claims by China that are inconsistent with the 1982 United Nations Convention on the Law of the Sea (UNCLOS), in particular, maritime claims that do not adhere to its rules on baselines, maritime zones and classification of features," the document states.