Oil sunk as investors weighed developments in ongoing talks between world powers on a revival of the Iran nuclear deal. (Bloomberg) — Oil sunk as investors weighed developments in ongoing talks between world powers on a revival of the Iran nuclear deal, which would bring more supply to the market. Futures in London fell 1.1% on Tuesday after a Russian envoy in Vienna said significant progress has been made in efforts to broker an agreement between Iran and the U.S, the BBC Persian news channel reported. However, the same diplomat, Mikhail Ulyanov, subsequently took to Twitter to play down reports that a major announcement on the matter was likely on Wednesday. “I said that significant progress have been achieved, in my view,” Ulyanov said in the tweet. “That is true. But unresolved issues still remain and the negotiators need more time and efforts to finalise an agreement on restoration […]