Donald Trump, the self-proclaimed 'deal maker extraordinaire' is finding the Korean Peninsula tough going. For all his claims of friendship with the North Korean dictator Kim Jong-un, Pyongyang seems no closer to giving up its nuclear arsenal. America's strategic partnership with South Korea is looking increasingly strained too. Stephen Sackur interviews South Korean foreign minister Kang Kyung-wha. Her country is currently out of step with both the US and Japan; how vulnerable does that make South Korea? Show less