LONDON (Reuters) - Iran’s oil minister said on Tuesday that U.S. sanctions on Iranian crude exports mean difficult days for oil consumers worldwide, adding that waivers issued by Washington to eight importing countries will not satisfy market demand.

“The issued waivers have not been enough for the market demands... Unfortunately difficult days are predicted for oil consumers around the world in coming months,” Bijan Zanganeh was quoted as saying by the oil ministry’s news agency SHANA.