Japan has an extremely near-future tilted debt maturity timeline. Even though Japan is the United States’ third largest creditor, Japan itself has the highest debt-to-GDP ratio in the world. Eventually Japan will have to cut its budget, but currently they seem to be able to push debt further into the future. 2010 maturity timeline (below) shows that Japan was able to push ¥105 trillion into the future. It is doubtful that they will be able to continue this, considering the debt owed in 2011 is over ¥120 trillion.
Source: Japan Ministry of Finance.