SEOUL, May 21 (Reuters) - The following is a summary of major South Korean newspapers on Monday, prepared by Reuters in Seoul. Reuters has not checked the stories and does not guarantee their accuracy.

CHOSUN ILBO

- U.S. think tank Center for Strategic & International Studies warned in a report that U.S.-South Korea relations could deteriorate within the next 10 years if South Korea continues to aid North Korea and does not change its policy toward the North.

- The World Health Organisation (WHO) said South Koreans live 78.5 years on average, ranking No. 22 out of the 192 member states, above the United States.

- U.S. beef ribs may also be imported into South Korea in August or September at the earliest, according to an agricultural ministry official.

DONG-A ILBO

- Hyundai Motor Corp. <005380.KS> and Kia Motors Corp. <000270.KS> will invest a total of 935.1 billion won ($1 billion) to build or expand its plants in South Korea and install new equipment by the end of 2008, according to a Hyundai Motor official.

MAEIL BUSINESS NEWSPAPER

- The presidential Blue House is reviewing trends in short-term liquidity in the financial system, according to ministries involved in the review.

KOREA ECONOMIC DAILY

- A South Korean consortium led by Sungwon Corp. <012090.KS> will sign an MOU on Monday to redevelop a downtown area in Dubai by investing $20 billion, according to Korea Trade-Investment Promotion Agency.

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