President Obama (right) Chinese President Hu Jintao (center) and first lady Michelle Obama arrive for the State Dinner at the White House in Washington, DC, on Wednesday (Jan. 19, 2011). Mandel Ngan/AFP/Getty Images hide caption

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The U.S. and Japan are conducting joint exercises in the Sea of Japan, near the coast of South Korea. Here, the USS John McCain (L) pulls alongside the USS George Washington in the Sea of Japan. MC3 David Juan Pinalez /AFP/Getty Images hide caption

itoggle caption MC3 David Juan Pinalez /AFP/Getty Images