WASHINGTON —

President Donald Trump is urging NATO allies to stop buying Russian oil to cut off its main source of funding for its war in Ukraine, a move that experts warn could impact global oil supply and raise gas prices in the U.S.

"We're not buying oil from Russia. (NATO) is buying a lot of oil from Russia. That's not the deal," Trump said Sunday to reporters. "The sanctions that they're putting on are not tough enough, and I'm willing to do sanctions, but they're going to have to toughen up their sanctions commensurate with what I'm doing." Advertisement

President Trump called on NATO countries to step up and enforce a full boycott of Russian oil, including what experts say are hundreds of millions of dollars in profits from the 8 to 9 billion barrels of oil Russia produces e

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