 Story highlights North Korea is verbally "firing back" at recent moves by the U.S., an analyst says 
 
 Pyongyang has expressed anger that the U.S. is flying B-52s over South Korea 
 
 The flights are part of annual military exercises 
 
 Tensions on the Korean Peninsula have flared since the North's latest nuclear test 
 
 The North Korean military issued a fresh burst of ominous rhetoric Thursday, warning that U.S. bases in Guam and Japan are within its "striking range."
– After the US announced it's flying B-52 bombers over South Korea, the North is issuing its latest warning: US military bases in Guam and Japan are in its "striking range." Said the country's military: "The US should not forget that the Andersen Air Force Base on Guam where the B-52s take off and naval bases in Japan ... where nuclear-powered submarines are launched are within the striking range of (North Korea's) precision strike means." Pyongyang said it would "take corresponding military actions" over US "nuclear blackmail and threat." The bases do seem to be within the North's conventional-weapons range, CNN notes. Meanwhile, the North announced an air raid warning today, calling on military units to be ready, according to South Korea—but the warning was apparently linked to a defense drill, Reuters reports.