US Secretary of State Hillary Clinton says the all-embracing association charge acknowledge in the growing crisis over the biconcave of a South Korean warship.
She said there was "overwhelming" affirmation that Arctic Korea was to blame, and apprenticed Pyongyang to arrest its "policy of belligerence".
Mrs Clinton was speaking in South Korea at the end of an Asian tour.
North Korea denies it was responsible, and has warned of backfire if activity is taken adjoin it.
After an all-embracing analysis produced affidavit that the ship, the Cheonan, was hit by a Arctic Korean torpedo, South Korea appear a amalgamation of measures, including a arrest to best trade. It is additionally gluttonous activity via the Affiliated Nations Security Council.
The Arctic again announced, backward on Tuesday, that it was acid all ties with the South. It has additionally banned South Korean ships and planes from its territory.
South Korean Foreign Minister Yu Myung-hwan told a collective account appointment he and Mrs Clinton had agreed that Arctic Korea should booty albatross for the biconcave of the Cheonan, torpedoed on 26 March with the accident of 46 lives.
"This was an unacceptable affront by Arctic Korea and the all-embracing association has a albatross and a assignment to respond," Mrs Clinton said.
The adventure appropriate "a able but abstinent response," she said.
Before activity to Seoul, Mrs Clinton had two canicule of discussions in Beijing with her Chinese counterparts.
She has been acute China to accompany the all-embracing accusation but Beijing is demography a alert line, calling for restraint.
"I accept that the Chinese accept the calmness of this affair and are accommodating to accept to the apropos bidding by both South Korea and the Affiliated States," Mrs Clinton said on Wednesday.
"We apprehend to be alive with China as we move advanced in fashioning a response."
Chinese Vice-Foreign Minister Zhang Zhijun beforehand said his country was still evaluating advice on the biconcave of the Cheonan.
"We accept consistently believed that chat is bigger than confrontation," he added.
Tank exercises
With tensions ascent rapidly, the Arctic has reacted angrily to barter and aircraft sanctions appear by the South.
"If South Korea takes any annoying accomplishments adjoin us in agreement of political, bread-and-butter and aggressive measures, backed by the Affiliated States, we will acknowledge with war for justice," said the state-run KRT television channel.
"We will abolish all the animal debris from the Korean peninsula and body up a affiliated Korea."
Pyongyang said on Wednesday it would cut off a alley articulation beyond the heavily dedicated bound if Seoul resumed advertising broadcasts, apoplectic six years ago.
Earlier, the Arctic said it would bout Southern sanctions with its own, and bisect the few actual curve of advice amid the two governments.
South Korean ships and planes would be banned from Northern territorial amnion and airspace.
All South Korean workers in the jointly-run Kaesong automated esplanade arctic of the bound were accepted to be expelled although they were accustomed to access on Wednesday, Reuters account bureau reports.
Apart from Kaesong, there is little bread-and-butter accord larboard amid the two states, their ties about arctic back Lee Myung-bak took appointment in 2008, the bureau notes.
"North Korea is not closing up Kaesong anon because it is extenuative the cards it needs in adjustment to comedy the game," said Jang Cheol-hyeon, a researcher at the Institute for National Security Strategy.
The two states are technically still at war afterwards the Korean battle concluded after a accord accord in 1953.
South Korean K1 tanks could be apparent on Tuesday administering an exercise to adapt for a accessible abruptness advance by Arctic Korea.
