Oil prices settled slightly higher on Friday but posted a weekly decline, ending four straight weeks of gains, after U.S. President Donald Trump announced sweeping plans to boost domestic production while demanding that OPEC move to lower crude prices.

Oil futures tallied their first weekly loss in five weeks on Friday as recent comments from President Donald Trump suggested he would pressure major oil producers to boost crude output.

"You've got to bring down the oil price, you've got to end that war. They should have done it long ago," President Donald Trump said.

Ukraine said on Friday it had struck a Russian oil refinery and a microchip factory in a huge drone attack that caused fires at the refinery's production facilities and an oil pumping station. Russia said hours earlier that its forces had repelled an overnight drone attack,

The General Staff of Ukraine's Armed Forces confirmed an attack overnight that hit Russia's Ryazan Oil Refinery and the Ryazan Thermal Power Plant, leaving them ablaze Thursday morning.