Intentions are a different matter. States can never be certain about the intentions of other states, because intentions are inside the heads of leaders and thus virtually impossible to see and difficult to measure. In particular, states can never know with complete confidence whether another state might have its gun sights on them for one reason or another. The problem of discerning states’ intentions is especially acute when one ponders their future intentions, since it is almost impossible to know who the leaders of any country will be five or more years from now, much less what they will think about foreign policy.