evidence: The PRC said in January it would open west-east routes — in other words, toward Taiwan — on the two flight paths from Xiamen and Fuzhou. In mid-April, the PRC’s civil aviation regulator said the routes were now operating and that it would "further optimize" airspace around Fuzhou airport beginning May 16. [...] Taiwan’s Civil Aviation Administration said the PRC’s move seriously threatens aviation safety. Near Kinmen, the PRC’s and Taiwan’s flight paths are only about 2 kilometers apart. [...] Taiwan prohibits PRC aircraft from entering its airspace around Kinmen and Matsu.