U.S. and global oil futures declined on Thursday as a hefty rise in last week’s U.S. supplies and uncertainty surrounding tariff disputes helped to weaken the outlook for crude demand, prompting prices to settle at their lowest levels of the year.

Thanks to abundant supply and fairly flat demand, oil prices are forecast to fall — unless tariffs and geopolitics get in the way.

Oil prices finished with daily gains on Friday after new sanctions were imposed on Iran's crude exports but prices were down for the week as investors worried about U.S. President Donald Trump's renewed trade war on China and threats of tariffs on other countries.

Oil futures on Wednesday marked their lowest settlement prices of the year, after official U.S. data showed a weekly climb of nearly 9 million barrels in U.S. crude inventories and as the U.S.-China trade battle threatened to dent demand.

Oil prices moved up on Friday after new sanctions were imposed on Iran's crude exports but were hurt by U.S. President Donald Trump's renewed trade war on China and threats of tariffs on other countries.

Oil prices inched up on Friday but were still on track to record a third consecutive weekly loss, as prospects of a renewed trade war between the US and China raised concerns about crude demand growth.