On August 31, 2016 in Cincinnati, Ohio, speaking at The American Legion's national convention, Hillary Clinton said she'd meet China and especially Russia with "serious political, economic and military responses" if they do a cyberattack against the United States. Recently, Russia has been blamed for numerous cyberattacks targeting multiple American political institutions, though no real evidence has come to light concerning whether they were involved and Putin and the Kremlin have denied involvement.
However, if there is another cyberattack which Russia is blamed for, this likely could open the door for "military responses" against Russia in a Hillary Clinton administration, given the current trend in her rhetoric. An interpretation of this rhetoric which does not give the benefit of the doubt, using evidence that comes from her past support of wars, suggests that "military responses" may mean war. The United States, Russia, and China all have nuclear weapons. Another leak to Wikileaks of documents from the Democratic Party establishment likely constitutes the definition of a cyberattack in Hillary Clinton's eyes, as Wikileaks brought up on Twitter on September 3, 2016.