Negotiators in Vienna were unable to reach a comprehensive agreement aimed at resolving the impasse over Iran’s nuclear research program. British Foreign Secretary Philip Hammond said progress had been made , though it was “not possible to get an agreement by the [original] deadline.” Brent crude oil prices moved above the $80 mark in recent trading days, though word of an extension to June for negotiations with Iran pushed the global benchmark price down by about 50 cents to $79.90 for the January contract. Iran secured modest relief from sanctions one year ago during multilateral talks. Under the terms of an agreement, Iran can export about 1 million barrels of oil per day if it maintains its commitment to curb nuclear activity. It’s unclear how sanctions will be enforced following Monday’s agreement […]