Pwysleisiodd Lesley Griffiths hefyd pa mor bwysig yw i wahanol Lywodraethau'r DU barhau i gydweithio'n agos ar ôl i'r DU ymadael â'r UE ar 31 Ionawr.
Lesley Griffiths also stressed the importance of governments across the UK continuing to work closely together after the UK leaves the EU on 31st January.