FUKUOKA — Leaders of Japan, China and South Korea pledged Saturday to enhance coordination to counter the global economic turmoil in their first-ever trilateral summit.

During the summit in Dazaifu, Fukuoka Prefecture, Prime Minister Taro Aso agreed to a request by South Korean President Lee Myung Bak to increase Japan's currency-swap agreement with Seoul to $30 billion.

Aso, Lee and Chinese Premier Wen Jiabao also pledged their commitment to expedite the Chiang Mai Initiative and boost currency swaps.