Japan-China relations of the 1950s developed as the Cold War/hot war in East Asia took shape. Communist victory in the Chinese Civil War derived not just from the CCP's military superiority backed by Soviet support. Hong Kong especially became a base of activity for various democratic parties during the Chinese Civil War and even after the PRC's founding. China tried out various positive approaches toward Japan after the establishment of the Hatoyama administration, in addition to accumulating real accomplishments from exchanges through China's "private leading the public" policy and "gradualist approach". The Nagasaki flag incident is not thought of these days as having been a decisive factor for China when considering turning points in its Japan policy. In the course of the Korean War, Japan was tied ever firmer to America's Western bloc. Thereafter, the Sino-Soviet split would begin to exert a large influence on relations with Japan.