""If the price came down, the Russia-Ukraine war would end immediately," he said via videolink at the World Economic Forum in Davos, Switzerland."Right now the price is high enough that that war will continue, you gotta bring down the oil price and end that war," he added.Lower global oil prices would deplete Russia's main source of revenue that it uses to fund its war in Ukraine, though a recent analysis in Foreign Policy suggested any effects would likely take months to significantly hamper the Kremlin's war machine.OPEC consists of 12 countries including Iraq, Iran, Kuwait, and Saudi Arabia, which collectively account for around 30% of the global oil supply. By agreeing to lower or raise the amount of oil they all produce, OPEC can dramatically affect the global oil price.Another Trump policy — declaring  open season on drilling for U.S.