And just how can China persuade N. Korea not to test? They already offered him food and he kept the trains. Who can take anything Kim says serious?
They can completely shut down Sino-N. Korean border.
And just how can China persuade N. Korea not to test?
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Simple... The Chinese do not let lil' Kim leave China. They place him under house arrest and then announce to the world that Kim is 'recuperating' in a sanatorium due to the stress of leadership.
And furthermore, Kim will still rule North Korea via telephone.
Then the Chinese, using voice altering equipment, run North Korea until there is a coup or the regime collapses.
:-P