Gideon Rachman writes:  As it adapts to Japan’s new circumstances the Hatoyama government has, almost unwittingly, initiated a debate about the value of Japan’s alliance with the US. Some western observers in Tokyo muse that perhaps Japan is once again following its historic policy of adapting to shifts in global politics by aligning itself with great powers. Before the first world war the country had a special relationship with Britain. In the inter-war period Japan allied itself with Germany. Since 1945, it has stuck closely to America. Perhaps the ground is being prepared for a new “special relationship” with China? – Financial Times