Contracts expiring in June traded for 8,355 in Chicago as of 7:47 a.m. Tokyo time today. That’s 6.6 percent less than the futures closing level yesterday of 8,950 in Singapore. Standard & Poor’s 500 Index futures fell 0.9 percent to 1,242.90. The yen reached a post-World War II high against the dollar as the risk of radiation leaks from crippled nuclear plants in Japan stoked speculation insurers and investors will redeem overseas assets to pay for damages.