The U.S. and China have reportedly engaged in their first informal nuclear talks in five years, with the Taiwan issue at the forefront. What Happened: The discussions took place in March, with Chinese representatives assuring their U.S. counterparts that they would not resort to nuclear threats over Taiwan, Reuters reported on Friday, citing two American delegates who attended. The U.S. delegates had expressed concerns that China might use or threaten to use nuclear weapons in the event of a conflict over Taiwan. Beijing, however, stated that it is confident in its ability to prevail in a conv…