Pe na bai’r DU wedi dod i gytundeb mewn pryd iddo allu cael ei ddilysu erbyn 31 Rhagfyr, byddai’r DU a Japan wedi gorfod troi at ddefnyddio rheolau Sefydliad Masnach y Byd (WTO).  Byddai hyn wedi arwain at osod rhwystrau masnachu (tariffau ac eraill) a fyddai, o’u cymharu â’n sefyllfa bresennol, wedi bygwth y cysylltiadau masnachu a buddsoddi cryf sydd wedi datblygu rhyngom:Masnach – Yn 2019, cafodd gwerth £935.1 miliwn o nwyddau eu masnachu rhwng Cymru a Japan.  Japan yw ein 12fed farchnad allforio fwyaf a’n 6ed farchnad fewnforio fwyaf.Mewnfuddsoddi – mae gennym bellach tua 65 o fusnesau yng Nghymru sy’n eiddo i Japaneaid, yn cyflogi dros 8,000 o bobl.
Had the UK failed to reach agreement in time for ratification by the 31 December, we would have seen the UK and Japan revert to trading on WTO terms.  The resultant imposition of barriers to trade (tariff and non-tariff) compared to our current arrangements would have put at risk the strong trading and investment links that have been developed:Trade - in 2019 trade in goods between Wales and Japan was worth £935.1 million. Japan is our 12thlargest export market and our 6thlargest import market.Inward Investment - we now have approximately 65 Japanese-owned businesses based in Wales employing over 8,000 staff.