\65. tne non-pro1 i fer:rtion Treaty is -regarded by nany as an inportant achievement in the area of nltclear-ams regulation. The Treaty entered into force in 1970 and the nrjrber of parties has increased to about -11, States. The operation of the non-proliferation T"eaty was reviewed in L9T5 and a second review conference is taking pJ-ace in l-9B0, Those States i,rhi ch have chosen not to adhere to the Treaty h:ve criticized vhat they eonsider Lo be the inequality in and the discriminating ^1,'Fq.+aF ^f +ha TrAAllr in avnlririno 1-hcir deniqion to relPct i|'- \6€, Tn Lh.= rlerind qincF +.1-a Tr"arr'. antar"p4 intn 'n-na car/cy'e I 'lewe lon.nents have altered the international environment in which the non-proliferation Treaty .r'pr eiFc :nri affccl-.cd Lha rpr^eniinnq ^a thp Trerav ThFre has heen a Lack of pro6ress in the super-Power negatiations on nuclear disamament; a number of States are concerned at the possibility of the spread among States of nuclear explosive capability and many States are anxious to obtain access to secure ^1- aharorlinnlrrdirr nrrn l ea r orrr'rov ),65a. Ln one deve-Lopnent) ior.e supplicr countries book steps outside the non-proli feral ion Treaty structive to p]ace conditions on supply ol nuclear nrierr'al cnrrinnent en.l 1-trnhnrrln',rr Thcse inclrrde the Erridelines of the lluclear S rrn"irne rrrrrr (Tnndnn l-',.h) s 'r.F <r1.- li6r nountries maintaine,r that these pu}]j,fisrr uruu! \lvrLuvl vfqv/ i guidelines were framed. out of concern i'or the need. to stren€lthen non-proliferation allr.ngLncnts. In thc r.iew of any obher coltries, howevero these guidelines haYe amounted to a reinterpretation of some af the Treaty provisions. A1so, some^/ 35 / 3')?- trnglish ilnn€]x countries ex-Dressed dissatisfaction that measures taken by certain supplierstates' individually and jointly, pl-ace greater restrictions and controfs on thepeaceful uses of nuc_Lesr technology.