There is still work to be done to finalise the details, and we are clear that the Welsh Government must be fully involved in discussions on devolved matters or issues that impact Wales.
Mae gwaith i'w wneud o hyd i gwblhau'r manylion, ac rydym yn glir bod yn rhaid i Lywodraeth Cymru chwarae rhan lawn mewn trafodaethau ar faterion datganoledig a materion sy'n effeithio ar Gymru.