Since Russian annexation of Crimea, in March 2014, international community experiences massive use of information warfare in international affairs. In last 3 years, informational warfare became one of the most challenging issues not only for Europe and European Union, but also for the United States. Information warfare can be considered now as a very powerful tool, by which political integrity of states and alliances can be influenced. It is used by not only state actors (national states), but also non-state actors, such as ISIS to achieve various goals. The main goal of this article is to show, how easily and non-visibly can information warfare influence development in international affairs.