Brent crude futures fell 31 cents, or 0.4%, to $77.98 a barrel by 0124 GMT after settling up 1.1% on Friday.
The U.S. later said it shot down a missile fired at one of its ships from Houthi militant areas of Yemen.
"As the Middle East conflict is currently not affecting oil production, the geopolitical risk premium priced in oil prices now appears modest based on the implied volatility of options," Goldman Sachs analysts said in a note.
"While unlikely to materialize in our view, we estimate that oil prices would rise 20% in the first month of a Strait of Hormuz interruption, and may temporarily double in a less likely extended disruption."
In Libya, people protesting against perceived corruption threatened to shut down two more oil and gas facilities after shutting the 300,000 barrel-per-day Sharara field on Jan. 7.
Persons:
Joe Biden, Goldman Sachs, Martin Luther King
Organizations:
U.S, . West Texas, British
Locations:
Yemen, Red, Iran, Gaza, United States, Strait, Hormuz, Libya, U.S