One of America's most senior military commanders who oversees the US nuclear weapons program has urged the United States to dramatically upgrade its defense capabilities, warning that the China was developing nuclear weapons faster than the U.S. and adding: 'The big one is coming'.

Navy Adm. Charles A. Richard, the commander of U.S. Strategic Command, issued an unusually blunt warning on Wednesday, saying that China's nuclear threat was a 'near-term problem'.

'As I assess our level of deterrence against China, the ship is slowly sinking,' Richard said. 

'It is sinking slowly, but it is sinking, as fundamentally they are putting capability in the field faster than we are...'

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