China’s U.N. ambassador on Tuesday dashed Western hopes for a swift agreement on a fourth round of U.N. sanctions against Iran over its nuclear program, saying the issue requires more “time and patience.”

“This is not the right time or right moment for sanctions because the diplomatic efforts are still going on,” Chinese envoy Zhang Yesui told reporters…

“Zhang’s remarks confirm what we’d already suspected was the case — that it’s going to take a long time to convince the Chinese,” a Western diplomat said on condition of anonymity.