By Samuel Shen, Casey Hall and Ellen Zhang SHANGHAI/BEIJING (Reuters) -For Chinese businessman Han Changming, disruptions to Red Sea freight are threatening the survival of his trading company in the eastern province of Fujian. Han, who exports Chinese-made cars to Africa and imports off-road vehicles from Europe, told Reuters the cost of shipping a container to Europe had surged to roughly $7,000 from $3,000 in December, when Yemen’s Iran-aligned Houthi movement escalated attacks on shipping. “The disruptions have wiped out our already thin profits,” said Han, adding that higher shipping-insu…