(Reuters) -- Chinese Premier Wen Jiabao called on Northeast Asia's powers to cooperate more in the face of global economic headwinds, as China, Japan and South Korea agreed at a summit Sunday to launch negotiations on a three-way free trade pact soon.
The three nations together accounted for 19.6 percent of the world's economy and 18.5 percent of its exports in 2010, according to a feasibility study of the proposed trade pact that the governments issued late last year.
But they are also divided by political distrust, trade barriers and diverging investment policies.
There are many instable, uncertain and unpredictable factors in Northeast Asia and East Asia, China's Wen said at the meeting in Beijing attended by Japanese Prime Minister Yoshihiko Noda and South Korean President Lee Myung-bak.
The international financial crisis is not yet over and the prospect of the European debt crisis is uncertain, Wen said, according to a report from the official Xinhua news agency.
The three governments plan to counter such worries by launching the talks for the free trade agreement, an idea that has been under discussion for a decade.
We are pursuing high-level economic cooperation as part of our national strategy, Noda told the Wall Street Journal in an interview before the summit. The Japan-China-Korea FTA is an extremely important piece of it.
The three leaders also agreed to a three-way investment treaty - one stepping stone to the bigger and much more contentious goal of a free trade deal - said Xinhua.
China is the biggest trade partner of both Japan and South Korea. A free trade treaty could lift China's GDP by up to 2.9 percent, Japan's by 0.5 percent, and South Korea's by 3.1 percent, Xinhua said, without citing the basis for its estimates.
China is simply a huge market, said Noda, according to the Wall Street Journal. That's all there is to it.
Yet even China acknowledged the negotiations on a three-way trade agreement are likely to be difficult.
The conclusion of the feasibility study in 2011 and the nearly finalization of the three-way investment treaty has paved the way for launching the FTA talks, but that only marks one step forward along the long negotiation journey, Xinhua said in a commentary Sunday.
More importantly, political trust is badly needed in this sensitive region, not only in political affairs but also in economic ties.
Tokyo and Beijing have long been in dispute over territorial claims in the East China Sea, where both sides stake claims to potentially valuable gas beds.
Beijing also faces insistent demands from Tokyo and Seoul to put more pressure on North Korea, whose nuclear weapons ambitions and rocket tests have alarmed the region.
Wen told the summit that the pressing task is to do our utmost to prevent tensions on the Korean peninsula from escalating.
(Additional reporting by Mari Saito in Tokyo; Editing by Jeremy Laurence)