"May you live in interesting times," the saying goes. With an abundance of international developments, Professor Stephen M. Walt of the Harvard Kennedy School of Government shares his expertise with Policy Fellow Roger Hiton on the mega changes and forces shaping the global future including the intensifying struggle between the Yalta and Helsinki worldviews, if hegemons are still possible, how alliances are being reconceptualize and if the current trend of asymmetric warfare needs to be addressed with escalation to deter future aggression.