HomeRecent Actions for Treaties for Which the United States is Depositary ...Arms Control Recent Actions hide Arms Control Recent Actions Depositary Actions - Treaty Affairs Office of Treaty Affairs Biological Weapons Convention – Notification of Deposit of Instrument; South Sudan, February 15, 2023 Biological Weapons Convention – Notification of Deposit of Instruments; Niue and Central African Republic, New Zealand Niue declaration, December 23, 2019 Tags Arms Control Arms Control Multilateral Treaties