The First Minister requested an urgent call with the Prime Minister to discuss the action that could still be taken to secure a more ambitious future for this important sovereign asset.
Mae'r Prif Weinidog hefyd wedi gofyn am gyfarfod brys gyda Phrif Weinidog y DU i drafod yr hyn y gellid ei wneud o hyd i sicrhau dyfodol mwy uchelgeisiol i'r ased sofran pwysig hwn.