President Barack Obama is in Tokyo, Japan Friday for the first stop of his four-nation tour of east Asia.

The president has been meeting with japans' new Prime Minister Yukio Hatoyama. The two leaders vowed to renew their nations' partnership in an effort to keep up with a fast changing world.

Obama said the U.S. and Japan must "find ways to renew and refresh the alliance for the 21st century."

The president's agenda includes the international economy, climate change, global security and the war in Afghanistan.

Before arriving in Japan, the president stopped at U.S. military base in Alaska to address American troops.

He promised to give them a clear mission if he decides to put their lives at risk to protect the American people or U.S. interests.