First, use Psalm 91; but definitely get "Psalm 91 - True Life Stories with case histories" from Peggy Joyce Ruth. .. Next, pray to St. Michael the Archangel to subdue the evil dictators. http://www.theworkofgod.org/Saints/Lives/SMichael.htm ... If enough people do this, the evil ones will self-destruct. However, we don't know in advance how the situation(s) will play out - whether there will be an actual physical war or not. In any event, the prayers will help insure the victory of Good over evil; and we can look to cases like Nebuchadnezzar to get an idea of the end result.