Here's a closer look at complicated relations between China and the United States. It's the ties painstakingly forged over four decades for the benefit and better understanding between two crucial nations. There were ups and downs in that long relationship, but it seems there’s no other time those ties are frayed — and severely tested — as the last four years. How has Trump policies on China turned out? Are they really a radical departure from previous US administrations? How have they shaped not only bilateral relations but world diplomacy and trade? A special program on China-US relations from World Insight.