The Latest: US Navy watching North Korean situation closely

SEOUL, South Korea – The latest on North Korea's announcement that it conducted a hydrogen bomb test on Wednesday (all times local):

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10:00 a.m.

U.S. Navy Vice Admiral Joseph Aucoin, commander of the 7th Fleet based in Yokosuka, Japan, says the Navy is watching North Korea closely after the country conducted its fourth nuclear test.

Aucoin told reporters Friday morning that the Navy has ships in the area and is monitoring very closely, and added that he could not be more specific.

He says, "We want them to abandon any nuclear activities and comply with the international commitments and obligations. Until they do that they're not going to achieve prosperity, they're not going to achieve the security they desire. They're going to live in isolation."

Aucoin spoke aboard the USS Ronald Reagan at the Yokosuka naval base.

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7:25 a.m.

U.S. Secretary of State John Kerry has urged China to end "business as usual" with North Korea after its nuclear test.

Kerry told reporters in Washington that he spoke by phone Thursday with Chinese Foreign Minister Wang Yi. He said that China's approach to North Korea had failed.

"Now China had a particular approach that it wanted to make and we agreed and respected to give them the space to be able to implement that, but today in my conversation with the Chinese I made it very clear, that has not worked and we cannot continue business as usual," Kerry said.

The U.N. Security Council that has pledged new sanctions against North Korea after its purported hydrogen bomb test on Wednesday. China has a pivotal position as it is a permanent council member and the North's main trading partner.