It follows extensive negotiations over the past nine months with the European Commission, and its adoption of the UK Partnership Agreement on 29 October, an EC regulatory requirement.
Daw hyn ar ôl trafodaethau helaeth â'r Comisiwn Ewropeaidd dros y naw mis diwethaf, a'r broses o fabwysiadu Cytundeb Partneriaeth y DU ar 29 Hydref, sef un o ofynion rheoliadol y Comisiwn.