Optimism over a breakthrough in talks remains limited, with the U.S. and its allies relying on the corrosive effect of sanctions on Iran's economy to slowly raise the pressure on Tehran, while the Iranians seek to leverage their position as the world's fifth-largest oil supplier in a tightening global market to offset economic pressure. On both sides, it's a long game, with Iran trying to work the differences between the U.S. and its closest allies, on the one hand, and the likes of China, Russia, Turkey and Brazil on the other over tactics and what constitutes an acceptable outcome to the standoff.
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