Oil prices nudged up Monday, staying close to two-week highs as winter storm Fern forced shutdowns across parts of U.S. oil and gas regions. The standoff between Washington and Tehran also kept traders cautious, pushing up risk premiums. Brent, the global benchmark, gained 7 cents, or 0.1%, to $65.95 a barrel by 1107 GMT; U.S. West Texas Intermediate added 3 cents, or 0.1%, to $61.10. Both contracts wrapped up last week with a 2.7% rise. Phillip Nova analyst Priyanka Sachdeva described the move as a “mild upswing” amid tighter physical flows. JPMorgan estimated weather-related output losses at roughly 250,000 barrels per day. Meanwhile, President Donald Trump said the U.S. has an “armada” en route to Iran, while an Iranian official warned any attack would trigger “all-out war.” Despite this, the Caspian Pipeline Consortium reported it had resumed full loading capacity, and Kazakhstan’s Tengiz field started ramping back up.