The U.S. is concerned about North Korea’s “strengthened rhetoric” surrounding nuclear weapons, a State Department spokesman said Thursday, shortly after DPRK state media aired an expletive-laden speech by the leader’s sister Kim Yo Jong threatening the South.

Principal deputy spokesperson Vedant Patel also said that the U.S. is “prepared to make both short and longer-term adjustments to our military posture as appropriate in responding to any DPRK provocation,” citing North Korea’s preparations to conduct a nuclear test.