Brent crude futures were at $95.61 a barrel by 05:06 GMT, up $1.17, or 1.2%, after earlier hitting a peak of $96.16, the highest since October 2014. U.S. West Texas Intermediate (WTI) crude rose $1.41, or 1.5%, to $94.51 a barrel, hovering near a session-high of $94.94, the loftiest since September 2014. Comments from the United States about an imminent attack by Russia on Ukraine have rattled global financial markets. Russia could invade Ukraine at any time and might create a surprise pretext for an attack, the United States said on Sunday. "If ... troop movement happens, Brent crude won"t have any trouble rallying above the $100 level," OANDA analyst Edward Moya said in a note. "Oil prices will remain extremely volatile and sensitive to incremental updates regarding the Ukraine situation." The tensions come as the Organization of the Petroleum Exporting Countries (OPEC) and its allies, OPEC+, struggle to ramp up output despite monthly pledges to increase production by 400,000 barrels per day (bpd) until March. The International Energy Agency said the gap between OPEC+ output and its target widened to 900,000 bpd in January, while JP Morgan said the gap for OPEC alone was at 1.2 million bpd, Reuters reported. "We note signs of strain across the group: seven members of OPEC-10 failed to meet quota increases in the month, with the largest shortfall exhibited by Iraq," JP Morgan analysts said in a February 11 note. The bank added that a super-cycle is in full swing with "oil prices likely to overshoot to $125 a barrel on widening spare capacity risk premium". — Agencies