Oil slipped after posting its biggest gain in more than a week on Monday as investors monitored US-Iran nuclear talks and the outlook for demand amid an economic slowdown. West Texas Intermediate futures dropped below $90 a barrel after closing 2% higher in the previous session. Uncertainty around Iranian supply aided crude’s drift higher with a conclusion to the long-running nuclear talks edging nearer after European Union diplomats presented the US and Iran with a final draft accord to revive the 2015 deal. Futures remain less than $3 above a six-month low and thin volumes are keeping prices volatile. Crude may continue to weaken before rallying in winter as the US winds down releases from strategic stockpiles and an EU embargo on Russian supplies takes effect, Energy Aspects said Monday. “The drop in Brent oil prices well below $100 a barrel last week could be the market positioning for […]