President Donald Trump’s decision to withdraw from the Iran nuclear deal could pile pressure on OPEC’s pact to limit production and upset the delicate balance among its disparate signatories, analysts say. Oil prices hit 3½-year highs this week amid expectations that renewed U.S. economic sanctions will squeeze Iran’s oil supply and escalate regional tensions that have the potential to further limit the flow of crude. But the oil price had already been gaining thanks to a 2016 deal between members of the Organization of the Petroleum Exporting Countries and other big producers like Russia, which have reduced global oil supply by 2%. The group is set to meet in June to decide whether they’ll extend the deal beyond this year. If U.S. sanctions take Iranian oil off the market, leading to further price gains, some signatories may conclude that it is mission accomplished for a pact whose purpose was […]