SEOUL, March 10 (UPI) -- Kim Yo Jong, the powerful sister of North Korean leader Kim Jong Un, warned Tuesday that the ongoing U.S.-South Korea Freedom Shield joint military exercise could lead to "unimaginably terrible consequences," while appearing to reference Washington's widening conflict with Iran. Kim, recently promoted to department director level in the North's ruling Workers' Party, issued the statement through the state-run Korean Central News Agency a day after the allies began their