Oil prices pulled back after a dramatic surge to a four-year peak above $126 a barrel today, as traders weighed the risk that the US-Iran war could intensify into a longer conflict and choke Middle East supplies in a way that would threaten global economic growth. The rally gathered pace earlier after Axios, citing unidentified sources, reported overnight that US President Donald Trump was due to be briefed today on plans for a series of military strikes on Iran, an effort aimed at pressuring Tehran back into talks over its…