Nouriel Roubini. Tom Williams/Getty Images The US and China are on a collision course that's set to worsen a "geopolitical depression," Nouriel Roubini said. "Fragmentation and decoupling are becoming the new normal," he said, warning that prospects for US-China cooperation are fading. Roubini previously said a geopolitical depression will have far-reaching economic and financial consequences. US-China relations are on a slow-motion collision course – and it's set to worsen a "geopolitical depression" that threatens huge economic and financial consequences, according to "Dr. Doom" economist Nouriel Roubini. Roubini, who is known for his doomsday economic predictions, sounded off on US-China tensions...