North Korea has warned it will not be intimidated by Donald Trump's threats in an "unprecedented" letter sent to other countries. "If Trump thinks that he would bring the DPRK, a nuclear power, to its knees through nuclear war threat, it will be a big miscalculation and an expression of ignorance," the letter said. "Trump threatened to totally destroy the DPRK ... it is an extreme act of threatening to totally destroy the whole world." The document was published by the Sydney Morning Herald and has been verified by Australia's foreign ministry. Foreign minister Julie Bishop described the missive as...