By Charlie Jones The Japanese government is reportedly preparing to build civilian bomb shelters with 30cm thick steel-reinforced concrete walls as tensions in the region escalate. The shelters will be for the residents of the islands of Okinawa Prefecture, which extend southwest from Japan towards Taiwan. The move comes over fears of a possible war between China and Taiwan. The Japan Self-Defense Forces are moving anti-aircraft and surface-to-ship missile batteries to the Nansei (or Ryukyu) island chains, which stretch southwest from Kyushu, the main southern island. Islands like Yonaguni, th…