the White House spokesman : U.S. has `` range of tools available '' to respond . U.S. in close consultation with South Korean , officials say . `` They are on their normal state of readiness . South Korea troops `` on their normal state of readiness , '' joint chiefs chairman says . Mike Mullen says U.S. must help U.S. in case of war .
the White House spokesman : U.S. has `` range of tools available '' to respond . U.S. in close consultation with South Korean , officials say . South Korea troops `` on their normal state of readiness , '' joint chiefs chairman says . Mike Mullen says U.S. must help U.S. in case of war .