He in the letters condemned the U.S. imperialists and their followers for having ignited the Korean War 60 years ago and committed brutal atrocities beyond human imagination even by using chemical weapons. Repetition of such acts should never be allowed, he urged.

He demanded that the south Korean authorities stop at once the moves for aggression against the DPRK and honestly implement the June 15 North-South Joint Declaration, ensure the right to the activities of the trade unions in south Korea and release the detained union members without delay.

The U.S. should not link with the DPRK the case of sinking of "Cheonan", warship of the south Korean puppet navy, aimed at bolstering its military presence and domination over south Korea, he stressed.