What action did hitler take in defiance of the versallies treaty

The main thing that Hitler did in defiance of the Versailles Treaty that upset the world was to bring back the German military, which was explicitly against the rules of the military. His reasoning for this action was to preserve the national defense of Germany, although this soon led to the invasion of Poland, which led to war. 

It covered the territory of land across eurasia from northeastern europe to the pacific ocean.