Crude prices fell Friday following the televised verbal argument between President Trump and Ukrainian President Zelinskyy and at the same time, Oklahoma energy stocks recorded gains.
Putting pressure on traders and investors was the decision by Iran to resume oil exports out of the Kurdistan region.
West Texas Intermediate finished down 59 cents or 0.84% at $69.76 a barrel on the New York Mercantile Exchange.
Brent crude dropped 86 cents or 1.16% and finished at $73.18 a barrel.
It was the first monthly decline in three months for both benchmarks.
Natural gas prices fell 11 cents for a 2.85% decline to $3.82 per MMBtu.
By a slight margin, more Oklahoma energy stocks had gains than losses in Friday’s trading.
Mammoth Energy rose 7% and Empire Petroleum and NGL Energy Partners each recorded a 5% increase.