Meanwhile, the U.S.is sending national security adviser John Bolton to Seoul and Tokyo to continue conversations with America's key allies in Asia.
Bolton may also have exchanges with Japanese officials on bilateral relations between Japan and South Korea, which are increasingly souring over export regulation and wartime compensation issues.
U.S. President Donald Trump said that he might go between South Korea and Japan concerning their disputes, if both wish.
The firms in question - Mitsubishi Heavy Industries and Nippon Steel & Sumitomo Metal Corp. - were ordered by Seoul's Supreme Court previous year to compensate Koreans forced into slave labor during World War II. I like President Moon, and you know how I feel about Prime Minister (Shinzo) Abe.
During his trip, Bolton is also likely to seek support for a USA initiative to heighten surveillance of vital Middle East shipping lanes, which has been greeted warily by allies reluctant to raise tensions with Iran, which Washington blames for attacks on tankers.
A North Korean propaganda outlet slammed Japan on Saturday for hampering efforts to create a reconciliatory mood on the Korean Peninsula with its retaliatory steps against South Korea suggesting Seoul's possible violations of sanctions on Pyongyang.
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The dispute between the key USA allies took a deadly turn when a South Korean man set himself on fire in front of the Japanese Embassy in Seoul in an apparent protest. The agreement is renewed each year and the South Korean government is required to notify Japan by August 24 to renew it this year.
The neighbors' conflict was exacerbated Friday when Japan's Foreign Minister Taro Kono summoned Korean Ambassador Nam Gwan-pyo after Seoul turned down Tokyo's proposal for the formation of a third-country arbitration to resolve historical disputes stemming from Japan's brutal acts during the 1910-45 colonial rule of the Korean Peninsula.
Responding to a call for reconsidering the extension of the military information-sharing pact with Japan, Chung said the government may do so, depending on the future situation.
South Korea has called the export restrictions "unjust economic retaliation" and its deputy national security adviser accused Japan of violating worldwide law by imposing them.
A spokeswoman for Moon confirmed Moon had asked Trump for help at their summit in Seoul on June 30.