Talks between North and South Korea aimed at arranging an unprecedented meeting between the prime ministers of the two countries bogged down Wednesday when the communists demanded an end to southern military exercises with the United States.

Negotiators ended two hours of talks shortly after noon but agreed to meet again on March 2 to continue efforts toward the first meeting of North and South Korean prime ministers. It would be the highest-level contact between the two sides since the Korean peninsula was divided in 1945.