China is showing early signs of stepping up imports of crude oil after months of subdued buying amid the US-Israel war on Iran, threatening to erode a buffer that has helped prevent a larger surge in global oil prices.But analysts do not expect China to quickly return to its pre-war import levels, as elevated crude prices could squeeze margins for Chinese refineries and the country’s stockpiles are still large enough to last for several months.Signs of a rebound in Chinese demand emerged in...