US President Barack Obama's meeting with Japanese Prime Minister Taro Aso on Tuesday will bring together leaders with starkly different political fortunes: While Obama enjoys worldwide popularity, Aso is struggling to stay in power. In selecting Aso as the first foreign leader to visit the Obama White House, however, the new US administration is interested less in giving him a boost than in sending a message, to Tokyo and to the world, that Japan, a sometimes-neglected ally, remains a vital partner in addressing global economic and security crises. Japan, which has the world's second largest economy, trails only China as the largest foreign holder of US Treasury bonds, holdings that help finance the ever-growing US budget deficit. Japan also is the lynchpin of US security efforts in Asia, hosting about 50,000 US military personnel and working with the United States and three other countries to press an increasingly hostile North Korea to give up its nuclear bombs. Washington's invitation to Aso, who arrived Monday night, was a broad signal "to the Japanese political establishment that the Obama administration is going to work with whoever is there," said Michael Auslin, a Japan specialist with the American Enterprise Institute think tank. "If we continue to wait for the next Koizumi, the next strong leader, we're going to be waiting forever," Auslin said, referring to popular former Prime Minister Junichiro Koizumi, who, since he left office in 2006, has been followed by a series of ineffectual leaders. Aso, of late, has faced single-digit approval ratings, appeals from his own party to resign and the worst Japanese recession in 50 years. His administration reached a low point last week when his finance minister stepped down after appearing to be drunk during a world finance ministers' meeting. Still, Secretary of State Hillary Rodham Clinton's response when asked in Tokyo about the embarrassing resignation signaled a US willingness to stand by Japan regardless of political or economic turmoil: "I think that the resilience of the Japanese people and the Japanese government is what's important here." Aso's visit, while symbolically important, might be overshadowed as Obama presses a series of politically sensitive economic initiatives; Aso comes to Washington on the day of Obama's first address to a joint session of Congress, which many in America will be watching closely. Japan has been looking for US reassurance about its place as the top US ally in Asia. Some in Tokyo are worried about increasing US cooperation with, and dependence on, China on a host of diplomatic, economic and military matters. Japan, despite its political and economic woes, remains a rich country and can play an important role in world affairs that the United States is hoping to influence, said Douglas Paal, a senior Asia adviser for former Presidents Ronald Reagan and George H.W. Bush, by refueling US ships, boosting aid for Afghanistan and Pakistan, buoying states facing economic crises. Clinton's decision to make Tokyo her first destination as secretary of state, as well as Aso's early White House visit, are important signals from the Obama administration. Japan still remembers that Clinton's husband, former President Bill Clinton, bypassed Tokyo during a trip to China in 1998. "The sentiment in Japan is quite delicate right now in terms of what place it holds in US priorities," said John Park, a senior researcher at the United States Institute of Peace. Secretary of State Clinton has also sought to soothe Japanese anger over the Bush administration's handling of North Korea's abduction of Japanese citizens in the 1970s and '80s. The United States, despite vehement public and private Japanese protestations, removed North Korea last year from a US terrorism blacklist, which Japan felt was one of the few levers negotiators had with the North on the abduction question. Clinton met with the families of kidnapped Japanese during her visit to Tokyo and pledged to give the matter a high priority in stalled disarmament talks with North Korea.