Oil prices fell on Friday, with Brent crude futures down 0.3% to $89.45 a barrel and West Texas Intermediate crude futures down 0.3% to $83.31 by 0035 GMT. Brent was headed for a 5.3% weekly decline and WTI for a 4.3% drop, putting both benchmarks on course to break two-week winning streaks. Prices had settled higher in the previous session after a Wall Street Journal report said U.S. President Donald Trump was not interested in returning to previous deal terms with Iran. The report said the Trump administration had repeatedly told mediators it did not want to revive the June memorandum of understanding, complicating efforts to restart talks. Washington said Thursday it was not negotiating with Iran, while the United States had announced what it called the "toughest sanctions in history" on Iran on Monday. Tehran called the measures an "inhumane and hostile act" and said they had lost their effectiveness. Geopolitical tensions also increased after Moscow warned it could strike British military targets inside and outside Ukraine in response to Kyiv's use of British-supplied long-range cruise missiles against Russian territory. U.S. President Donald Trump said Russian President Vladimir Putin would not attack a NATO (North Atlantic Treaty Organization) country and played down reports that CIA Director John Ratcliffe had warned Russian officials against such an attack.