A Plaid Cymru MS has called petrol companies "immoral scum" and accused them of using the Ukraine war to raise prices.
Mabon ab Gwynfor, MS for Dwyfor Meirionnydd, said companies were "cashing in on a crisis" by raising the cost of petrol and diesel, the latter of which is nearly £2 a litre in some parts of Wales.
Sharing an image of a pump at a rural Welsh filling station - which showed diesel at just under £1.97 per litre - Mr ap Gwynfor said that prices had soared despite there being no ban on Russian oil.