it when it entered into force and it took some of them actually france and china in particular some 20 years and other nuclear states india pakistan israel never joined never signed and north korea also as we know has been trying to to test and acquire nuclear weapons so we have a 9 problem state as far as international security is concerned with the threats of animate major risks and dangers from nuclear weapons now that the treaties and to enforce we have the legal and normative instrument and it's backed by a growing number of states not just the $84.00 who signed that but many more in the pipeline what we have to do is work together as happened with all treaties to build up and a verification and implementation system and to bring those additional states on board now i can has already been persuading cities all around the world including washington d.c. and los angeles and paris and and manchester and edinburgh here in the u.k.