'Things could go crazy quickly,' Biden warns on Ukraine as talks in Berlin fail

US president urges all Americans to leave Ukraine immediately, while British defence secretary heads to Moscow US president Joe Biden has warned that "things could go crazy quickly" in Ukraine and again urged American citizens to leave immediately, as the UK's defence secretary headed to Moscow in the latest round of diplomacy. "American citizens should leave, should leave now," Biden said in an interview with NBC News. "We're dealing with one of the largest armies in the world. This is a very d...