A University of Oxford professor has warned that the extended nuclear deterrence provided by the United States is "coming to an end," urging allies including Japan to consider other options.Janina Dill, co-director of the Oxford Institute for Ethics, Law and Armed Conflict, said in an online interview with Kyodo News that the Russian and Chinese nuclear threats mean Japan and Europe are unable to stand up to these states with conventional weapons.While both Japan and Europe are covered by U.S. extended deterrence, it may no longer be effective in the wake of the "America First" policies of …READ FULL ARTICLE