While the 2 governments will need to work through the detailed governance and operational arrangements, they have reached high-level agreement in a number of key areas:
Er y bydd angen i’r ddwy lywodraeth benderfynu ar y trefniadau manwl ar gyfer llywodraethu a gweithredu, maent wedi dod i gytundeb lefel uchel mewn nifer o feysydd allweddol: