On Wednesday, Barack Obama will land in Tokyo beginning a week-long trip to four of China’s neighbors—but not to China itself.

In Obama’s stops in Tokyo, Seoul, Manila, and Kuala Lampur, the specter of China will loom large. This will be especially pronounced in Tokyo, where the big unanswered question is how involved the United States would be if China seized the Diaoyu, the disputed islands administered by Japan, which calls them the Senkakus. We asked contributors what President Obama should say about China in Tokyo. —The Editors