Japan and the United States are strengthening their cooperation in response to the massive earthquake and tsunami that struck eastern and northeastern Japan on March 11.
The U.S. military are helping the Japan Self-Defense Forces to remove debris and transport relief supplies and personnel.
The two countries have established joint teams to bring the situation at a damaged nuclear power station in northeastern Japan under control.
During a telephone conversation on Wednesday, Prime Minister Naoto Kan expressed gratitude to U.S. President Barack Obama for U.S. assistance in the calamity.
He told Obama that Tokyo hopes to continue to be in close consultation with Washington and receive its support.