NEW : Obama , who made a reference to South Korea 's claim earlier this year that North Korea sank one of its vessels , said the United States `` will never waver in our commitment to the security of the Republic of Korea . '' President Obama lays wreath at war memorial . Comment: He 'll attend the G-20 summit , which is aimed at stabilizing the world 's financial markets . The G-20 has acknowledged that the global economic recovery is uneven and fragile .
NEW : President Obama lays wreath at war memorial . Comment: He 'll attend the G-20 summit , which is aimed at stabilizing the world 's financial markets . The G-20 has acknowledged that the global economic recovery is uneven and fragile .