For a few minutes, at least, there was a glimmer of hope for the world’s struggling oil producers. After months of opposing any production cuts, Russia said on Thursday it would be willing to discuss output levels with OPEC — opening the door for a deal with Saudi Arabia to revive oil prices hovering at $30 a barrel. Brent crude, the global benchmark, surged nearly 8 percent to $35.84 a barrel almost immediately. But the joy for oil producers — and some traders — was short-lived, and the price slid back to $34. Within minutes, OPEC delegates said they knew nothing about a potential […]