NEW : Obama to hold formal talks with South Korean President Hu Jintao in U.S. . NEW : New U.S. poll shows split on whether Chinese pose military threat . `` China needs to purchase these Treasuries in order to maintain a strong dollar . Obama tells students free flow of info a source of strength , despite sting . Beijing imports billions of dollars in Chinese products Friday .
NEW : Obama to hold formal talks with South Korean President Hu Jintao in U.S. . NEW : New U.S. poll shows split on whether Chinese pose military threat . Obama tells students free flow of info a source of strength , despite sting . Beijing imports billions of dollars in Chinese products Friday .