Japan is considering setting up an evacuation shelter for residents of the southern island prefecture of Okinawa in case of a potential contingency near Taiwan, which China considers its territory, a source familiar with the matter said Monday.The Japanese government is likely to step up defensive infrastructure efforts to protect its nationals in the southwestern Nansei island chain, including Okinawa's Miyakojima, where the shelter is expected to be built, the source said.The plan emerged as the mayors of local municipalities in Okinawa asked Chief Cabinet Secretary Hirokazu Matsuno durin…READ FULL ARTICLE