"As the threat from China and North Korea has been mounting, it is natural for Japan to counter this with more effective weapons systems," said Yoichi Shimada, professor emeritus at Fukui Prefectural University. "I think Japan should rapidly deploy longer-range missiles to develop more robust security." [...] Shimada believes that "proactive measures" such as boosting its missile systems will strengthen US-Japan ties and that "demands from the Trump administration for reciprocal defence arrangements with Japan are not so unreasonable". [...] "It is clear to anyone observing this that the US-Japan alliance is in bad shape," said Dujarric. "Even if China attacked Japan, there is no guarantee that the US under Trump would do anything. That is a big problem."