This was one of the big 3 failures of the League of Nations in the 1930s. In the 1920s they had already had no success in disarming, but in the 1930s there was increased pressure for the League to do something about disarmament. The Germans had long been angry about the fact that they had been forced to disarm while other nations had not done the same. Many countries were actually spending more in their armaments than they had spent before WWI.
In February 1932 the Disarmament Conference began. By July 1932 it had produced resolutions to prohibit bombing of civilian populations, limit the size of artillery, limit the tonnage of tanks, and prohibit chemical warfare. But there was very little in the resolutions to show how these limits would be achieved. For example, the bombing at civilians was to be prohibited, but all attempts to agree to abolish planes capable of bombing were defeated.
And the biggest problem of the Conference was what to do with Germany. Most people now accepted that they should be treated more equally than under the Treaty of Versailles. There was a dilemma between choosing whether:
Everyone else should disarm to the level Germany had been forced to.
Or the Germans should be allowed to rearm to a level closer to that of the other powers.
This is how events relating to Germany moved over the next 18 months.
Germany tabled proposals for all countries to disarm down to its level. When the Conference failed to agree the principle of equality the Germans walked out.
An agreement was finally reached to treat Germany equally.
Germany announced it was coming back.
Hitler became the chancellor of Germany and immediately started rearming secretly.
Hitler promised not to rearm if in five years all other nations destroyed theirs arms.
Britain produced and ambitious disarmament plan.
Hitler withdrew from the Disarmament Conference and soon after took Germany out of the League.
By this stage, all the powers knew that Hitler was secretly rearming Germany already, but instead of trying to stop him, everyone started to rebuild their own armaments. After another year of not achieving anything the Disarmament Conference ended in 1934.
Hitler used as an excuse for rearming Germany the fact that the other countries refused to disarm; and it was not fair that Germany kept on being unprotected and without a complete army while the other nations had not disarmed.