North Korea had been engaged in nuclear talks up through 2009 under the Six Party framework, involving Russia, China, South Korea, Japan and the United States.

Earlier this month, the USA imposed "robust" new sanctions, blocking businesses from any dealings with North Korea, in an attempt to punish Pyongyang for its nuclear tests.

South Korea urged its journalists Tuesday to exercise special caution when reporting near the Chinese border with North Korea amid heightened tensions following the North's nuclear and missile tests, a diplomatic source said.

The missile was sacked from near the North Korean coastal town of Wonsan at 5.40 p.m. (0840 GMT) and flew northeast for about 200 km and then "made contact" with the mainland, South Korea's military said in a statement.

North Korea usually test-fires its missiles and artillery into the sea.

Hours after the UN's decision, North Korea launched short-range projectiles into the Sea of Japan.

Pyongyang has repeatedly threatened to strike its southern neighbor since being hit with strengthened United Nations sanctions this year - in response to the North's fourth ever nuclear test in January and ensuing rocket launch in February.

The North has also protested against annual joint US-South Korean military drills, the guardian reported.

"On March 31st, the President will host President Park Geun-hye of the Republic of Korea and Prime Minister Shinzo Abe of Japan for a trilateral meeting on the margins of the Nuclear Security Summit", White House Press Secretary Josh Earnest said yesterday.

The report said North Korean UAVs were being spotted by the South's military surveillance system seven or eight times a day.

Washington is relying increasingly on its Asian allies to work together and says trilateral defense cooperation is critical to maintaining regional security.