Japanese PM Shinzo Abe, Chinese PM Li Keqiang and South Korean President Park-Geun-hye said in a statement they had agreed to resume regular trilateral meetings, not held since 2012.
They also agreed more economic co-operation.
The talks in the South Korean capital Seoul were an attempt to ease ill-feeling fuelled by territorial disputes and historical disagreements.
China and South Korea say Japan has not done enough to atone for its troops’ brutality in World War Two.
They talks were held regularly until three-and-a-half years ago, when they were called off as bad feeling towards Japan intensified.
“We shared the view that trilateral cooperation has been completely restored on the occasion of this summit,” South Korean President Park Geun-hye, Chinese Premier Li Keqiang and Japanese Prime Minister Shinzo Abe said in a joint statement, quoted by AFP.
Park Geun-hye said the three leaders had agreed to work together to conclude the Regional Comprehensive Economic Partnership (RCEP), a 16-nation free trade area favored by Beijing.
She said they maintained their goal of “denuclearizing” North Korea, AFP reported.
South Korea and Japan are torn between their allegiance to the US and their need to get on economically with Beijing.
Li Keqiang met Park Geun-hye on October 31 and the two agreed to try to increase trade, particularly through more Korean exports of food to China and co-operation on research into robotics.
The two leaders were joined by Shinzo Abe on November 1.
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