"All the documents of the past presented in front of the Reunification Palace today show it is clear that the right of Viet Nam on Hoang Sa (Paracel) and Truong Sa (Spratly) Archipelago are recognised around the world. It is obvious from the history and legal viewpoints," he said.
"Viet Nam should bring the case to the international court of justice even though China could refuse the jurisdiction in the case," he added.
He said Viet Nam should also try to create a strong group within ASEAN to try to settle the dispute by peaceful measures.
Mai Hong Quy, rector of the HCM City University of Law, said although the oil rig Haiyang Shiyou 981 was moved out of Viet Nam waters on July 15, this action caused bad precedence in international legal relations.
The conference, with the participation of some 50 legal scholars, was a chance for Viet Nam to hear from experts in international law about the possible legal solutions to settle disputes in the East Sea peacefully.
Jeanne Mirer, president of the International Association of Democratic Lawyers, said the conference was unprecedented as it was the first time such a large number of legal experts were assembled to speak about the East Sea issue.
She said it was important to ensure that the dispute did not escalate into a much broader military confrontation.
She said that international law provides that every country "shall have a 200 nautical miles of exclusive economic zone from its coastal line".
"The oil rig Haiyang Shiyou 981 was placed within the Exclusive Economic and Continental Shelf of Viet Nam and that is the major reason why it was a violation of the international law."
"China has many excuses for what it did, but those excuses really do not support international law," she added.
Chito Sta. Romana, president of the Philippines Association for Chinese Studies, told Viet Nam News on the sidelines of the conference that Viet Nam should learn from the experience of the Philippines in filing a lawsuit to China over the dispute on East Sea.
The event, which was organised by HCM City Law University and Viet Nam Bar Association, included three sessions on major topics, including international law and China's oil rig placement in the East Sea, settlement of disputes by political and diplomatic measures under international law, and settlement of disputes by legal measures in accordance with international law.
It was attended by international law experts from research centres, institutes and universities from the US, Russia, Italy, Switzerland, Hungary, Bulgaria, Poland, Thailand, South Korea, India, Indonesia, the Philippines, Japan and Singapore.
The East Sea is the world's second busiest sea lane through which more than half of the world's supertankers and $5.3 trillion worth of annual trade passes.
There are ongoing sovereignty disputes in the sea between China and several of its neighbouring nations, including Viet Nam and the Philippines.
