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Both Donald Trump and Kim Jong-Un have arrived in Singapore for their historic summit on the resort island of Sentosa. Never before has a North Korean leader met with a sitting US president, so the meeting will be the first of its kind. Speaking at the G7 summit earlier in the weekend, Mr Trump described the upcoming meeting with Mr Kim as a "one-time shot" at peace, and that it won't take long for him to know if the talks will be successful or not: