Japan's Prime Minister Yoshihiko Noda arrived in Washington Monday on a four-days official visit to the United States. Noda is scheduled to meet with US President Barack Obama in Washington later today where he will discuss ways of enhancing cooperation between the two countries on military security. The two sides are also expected to discuss the situation in North Korea and the Trans-Pacific Partnership Agreement (TPPA). According to Japan's (NHK WORLD) website, Noda spoke at the Japanese ambassador's residence in Washington. He was at a gathering to thank US troops and rescue workers who were part of the relief operation in northeastern Japan after the earthquake and tsunami last year.