11.   The United States and North Korea broke off talks in Berlin Thursday without reaching agreement on how to put a crucial nuclear accord into effect, the negotiators said.

12.   With deadlines approaching over the next few months for a key US-North Korea nuclear accord, Washington is pushing hard to make North Korea disarm.

13.   Paik said it is unthinkable that North Korea would risk losing the financial and diplomatic benefits promised under the nuclear accord.

14.   A deal with the United States on implementing a nuclear accord was reached Tuesday.

15.   A U.S.-led international consortium is being organized to finance the costs of the nuclear accord.

16.   A top critic of the U.S.-North Korea nuclear accord said Monday he foresees no effort by the new Republican-controlled Congress to overturn the agreement.

17.   Before freezing them under the nuclear accord, North Korea was believed to be using its reactors to fuel a weapons program.

18.   But North Korea has recently warned that the nuclear accord could be at risk unless Washington does more.

19.   But the president stopped short of threatening to undo the recent U.S.-North Korea nuclear accord.

20.   By yielding slightly on a point that American negotiators thought they resolved earlier, the North is demanding still more concessions in talks on implementing a historic nuclear accord.