US Secretary of State John Kerry vowed today to protect his Asian allies a day before a large-scale military rally was expected to be held in North Korea.
There are fears that tomorrow's celebrations to mark the birthday of the nation's founder, Kim Il Sung, could provide an excuse for another missile test.
ITV News' China Correspondent Angus Walker reports from Seoul:
US Secretary of State John Kerry was in Beijing to discuss North Korea situation - but does China have "more capacity to make a difference"?
When North Korea is threatening to launch missiles, targets unknown, there's a lot at stake.