Mae Gweinidog Cysylltiadau Rhyngwladol Llywodraeth Cymru, Eluned Morgan, Ysgrifennydd Gwladol Cymru, Alun Cairns a'r Cyng. Dyfrig Siencyn wedi llofnodi'r ddogfen.
Welsh Government Minister for International Relations Eluned Morgan, the Secretary of State for Wales Alun Cairns and Cllr Dyfrig Siencyn all signed the document.