Fifteen Asia-Pacific countries on Sunday signed the Regional Comprehensive Economic Partnership agreement, the world's largest free-trade deal, which was hailed by Premier Li Keqiang as "a victory of multilateralism and free trade".

The agreement involves all 10 member countries of the Association of Southeast Asian Nations and five of its major trading partners－China, Japan, South Korea, Australia and New Zealand.

With the largest participating population in the world, the most diverse membership and the greatest development potential, the RCEP will inject new impetus into regional development and prosperity, and contribute to the recovery and growth of the world economy, Li said as he participated in the fourth RCEP leaders' meeting via video link.

"The signing of the RCEP is not only a landmark achievement of East Asian regional cooperation, but also a victory of multilateralism and free trade," he said.

Li said that after eight years of negotiations, the signing of the agreement has brought hope to people amid the current grim international situation, showing that multilateralism and free trade remain the correct direction for the world economy and human progress.

The RCEP allows people to choose solidarity and cooperation when facing challenges, instead of resorting to conflict and confrontation, and also allows them to choose mutual assistance and support, rather than adopt a "beggar-thy-neighbor" approach or a "wait-and-see" attitude, he said, adding that it shows the world that opening-up and cooperation are the only way to achieve mutually beneficial outcomes.

The premier also underlined the important leading role played by ASEAN countries during the RCEP negotiations, saying that China will continue to firmly support ASEAN's central role in pushing forward the follow-up work regarding the implementation of the RCEP agreement.

The leaders of the participating countries witnessed the signing of the agreement and said the RCEP will remain open to India and that they welcome India's early involvement.

The total population and economic and trade volume of the 15 member economies account for about 30 percent of the world's total, indicating that about one-third of the world's economies now form an integrated market, said Wang Shouwen, vice-minister of commerce.

This will significantly boost regional trade and investment, reinforce industrial and supply chains, and enhance the ability of all parties to fight against the pandemic, as well as promote the economic recovery of all countries, and promote the region's long-term prosperity and growth, he said.

In the meantime, the pact will also provide a path and a strong impetus for the development of the Free Trade Area of the Asia-Pacific, or FTAAP, said Wang, who also is China's deputy international trade representative.