The U.N. Arms Trade Treaty took a major step forward on its eventual entry into force on Wednesday as 18 countries, including five of the world's top 10 arms exporters, delivered proof of its ratification to the United Nations.

Exactly one year ago, the 193-member U.N. General Assembly overwhelmingly approved the treaty, which aims to regulate the $85 billion arms industry and to keep weapons out of the hands of human rights abusers and criminals.

The treaty will enter into force once 50 countries have presented proof of ratification to the United Nations. With the latest 18 countries, there are now 31 ratifications out of 118 signatories, or 19 short of the number needed for the treaty to take effect.