Welsh Ministers and Welsh Government officials were engaged in discussions and briefings at a Wales and UK level, including those from SAGE and COBR.
Bu Gweinidogion Cymru a swyddogion o Lywodraeth Cymru yn rhan o drafodaethau a sesiynau briffio yng Nghymru ac ar lefel y DU, yn cynnwys y rhai gan SAGE a COBR.