China took exception to Japanese Foreign Minister Fumio Kishida's remarks that he would discuss the dispute over territorial claims with his Chinese counterpart Wang Yi.
Kishida had said he would talk about the maritime dispute if he gets a chance to meet Wang during the series of foreign ministers' meeting involving ASEAN and other Asian countries.
China's foreign ministry spokesperson Lu Kang said that the arbitration by a UN-backed international panel based in The Hague was "illegal and invalid" from beginning to the end.
It had also refused to participate in the arbitration process, claiming the tribunal lacks jurisdiction.
The Chinese spokesperson said that China's rejection of the award was "indeed in accordance with the international law and the UN Convention on the Law of the Sea."
"Japan is not a party to the South China Sea issue, and considering its shameful history, it has no rights whatsoever to accuse China on the matter," state-run Xinhua news agency quoted him as saying.
China and Japan have had a rather frosty relationship over a range of matters - including historical and economic issues.
Bilateral ties also strained due to a territorial row over a group of islands, known as the Senkaku islands in Japan and the Diaoyu islands in China. The issue ignites nationalist passions in both countries.
