Japan and the United States have been discussing a scenario, in which the U.S. military would use nuclear weapons in the event of a contingency, during talks on so-called extended deterrence, sources close to the two countries said Saturday.It is the first time the allies have delved into the issue, in a sign that they are seeking to strengthen the U.S. nuclear umbrella, under which Japan is protected, amid intensifying military activity by China, North Korea and Russia, the sources said.Japan is the only country to have experienced an atomic bomb attack and has long advocated for a nuclear…READ FULL ARTICLE