As dozens of countries from Europe to the Middle East to Africa jump on the bandwagon of joining the China-backed Asian Infrastructure Investment Bank (AIIB), Japan is opting to stay out for now, with officials believing it can sign up later if its conditions are met. Japanese officials have shrugged off the March 31 deadline set by China to become a founding member of the Beijing-based bank, and say they attach greater importance to conditions being met rather than when to join.