“Cyn i’r gyfres nesaf o negodiadau gael eu cynnal yn ddiweddarach y mis hwn, fe wnaethom gytuno y bydd raid cael proses ystyrlon, gynhwysfawr a thryloyw i'r Llywodraethau Datganoledig allu dylanwadu ar safbwynt negodi'r DU – rhywbeth sy’n amlwg heb ddigwydd hyd yma.
“Before the next round of negotiations later this month we agreed there must be a meaningful, comprehensive and transparent process for the Devolved Governments to influence the UK’s negotiating position – something that has clearly not happened so far.