Seoul/Washington (Agencies):Korean talks ended without any agreement as North and South Korea traded blame on Thursday for failed military talks, while a warning was issued by the US spy chief in Washington alleging that nuclear-armed North Korea poses a serious threat to security in East Asia.

Director of National Intelligence James Clapper said Pyongyang's nuclear programs, and the military attacks in 2010 that are at the center of a North-South stalemate, showed that North Korea's military may hamper regional stability.

He said while relating the attacks to succession in North Korea, "As demonstrated by North Korean attacks on the South Korean ship Cheonan in March 2010 and Yeonpyeong Island in November, North Korea is capable of conducting military operations that could potentially threaten regional stability."

Talking about leader Kim Jong-il's plans to hand power to his third son, Clapper in a US congressional hearing said, "Kim Jong-il may feel the need to conduct further provocations to achieve strategic goals and portray (Kim) Jong-un as a strong, bold leader, especially if he judges elite loyalty and support are in question."

North Korean state media blasted and refused anymore military talks with South until Seoul showed it wanted to improve ties and discuss security issues concerning both sides saying that it was South Korea's "impudent approach" to talks between the two nations.

However South Korea while putting their point forward said that its offer for senior-level talks with North Korea still stands, but demanded that dialogue focus on the two attacks, which killed 50 people, and that Pyongyang bear responsibility.

China, the isolated North's main ally and main benefactor, called on the two sides to keep contact and dialogue.

The first inter-Korean meeting since the North's attack on Yeonpyeong in November came to a halt because of procedural issues, including the agenda and the rank of participants at their next meeting.

The United States, which has nearly 30,000 troops in South Korea, said it expects the rivals to work out their differences and recommence their talks as soon as possible to trim down tensions on the divided peninsula.