BEIJING --Delegates from more than 60 countries have signed the Arms Trade Treaty to regulate global conventional arms trade.

Argentina was the first to sign when the ceremony opened at UN headquarters in New York on Monday. The UN said 62 countries signed in the morning. Germany was due to sign shortly, making it the 63rd. Several more states are likely to sign the treaty in the coming days.

The world’s Number One arms exporter, the United States, hasn’t signed. Secretary of State John Kerry said the US will do so as soon as all the official UN translations of the document are completed.

The Arms Trade Treaty aims to set standards for all cross-border transfers of conventional weapons, ranging from small firearms to tanks and attack helicopters. It would create binding requirements for states to review cross-border contracts. The 193-nation UN General Assembly overwhelmingly approved the treaty on April 2nd.