UNITED NATIONS, United States: A total of 18 countries filed documents on Wednesday (Thursday in Manila) ratifying a UN treaty to regulate the $80-billion-a-year conventional arms trade. One year after the Arms Trade Treaty (ATT) was adopted by the General Assembly, 31 countries have ratified it. The treaty will take effect once 50 UN member states ratify it. So far, 118 countries have signed it. “It is fair to say that at the current pace of signature and ratification, the ATT could well enter into force in the second half of this year,” said Virginia Gamba, deputy to the UN high representative for disarmament affairs.