On the 28th of November, Mexico became the 4th country to ratify the Treaty on the Prohibition of Nuclear Weapons, after the Holy Sea, Thailand and Guyana.

With a vote of 78 senators in favour with zero abstentions and zero against, the measure passed its final hurdle in the Mexican Senate.  All that remains is for the ratification instrument to be delivered to the United Nations Office of Legal Affairs in New York, something which is expected to happen in the coming days.

The treaty comes into force 90 days after the 50th country ratifies it.