(Reuters) – Credit default swap indexes measuring the cost of insuring against European corporate bond defaults jumped on Monday to their highest since 2020 as markets sold off sharply after red-hot U.S. inflation data and a COVID-19 warning in China. The spread on the iTraxx European Crossover index, which measures the cost of insuring exposure to a basket of sub-investment-grade European companies surged nearly 27 basis points (bps) to 525.6 bps, the highest since May 2020 when markets were gripped by the fallout of the coronavirus pandemic. It has risen nearly 90 bps over the last week as i…